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/**
 * PHPMailer - PHP email creation and transport class.
 * PHP Version 5.5.
 *
 * @see https://github.com/PHPMailer/PHPMailer/ The PHPMailer GitHub project
 *
 * @author    Marcus Bointon (Synchro/coolbru) &lt;phpmailer@synchromedia.co.uk&gt;
 * @author    Jim Jagielski (jimjag) &lt;jimjag@gmail.com&gt;
 * @author    Andy Prevost (codeworxtech) &lt;codeworxtech@users.sourceforge.net&gt;
 * @author    Brent R. Matzelle (original founder)
 * @copyright 2012 - 2020 Marcus Bointon
 * @copyright 2010 - 2012 Jim Jagielski
 * @copyright 2004 - 2009 Andy Prevost
 * @license   https://www.gnu.org/licenses/old-licenses/lgpl-2.1.html GNU Lesser General Public License
 * @note      This program is distributed in the hope that it will be useful - WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.
 */

namespace PHPMailer\PHPMailer;

/**
 * PHPMailer - PHP email creation and transport class.
 *
 * @author Marcus Bointon (Synchro/coolbru) &lt;phpmailer@synchromedia.co.uk&gt;
 * @author Jim Jagielski (jimjag) &lt;jimjag@gmail.com&gt;
 * @author Andy Prevost (codeworxtech) &lt;codeworxtech@users.sourceforge.net&gt;
 * @author Brent R. Matzelle (original founder)
 */
class PHPMailer
{
    const CHARSET_ASCII = &#039;us-ascii&#039;;
    const CHARSET_ISO88591 = &#039;iso-8859-1&#039;;
    const CHARSET_UTF8 = &#039;utf-8&#039;;

    const CONTENT_TYPE_PLAINTEXT = &#039;text/plain&#039;;
    const CONTENT_TYPE_TEXT_CALENDAR = &#039;text/calendar&#039;;
    const CONTENT_TYPE_TEXT_HTML = &#039;text/html&#039;;
    const CONTENT_TYPE_MULTIPART_ALTERNATIVE = &#039;multipart/alternative&#039;;
    const CONTENT_TYPE_MULTIPART_MIXED = &#039;multipart/mixed&#039;;
    const CONTENT_TYPE_MULTIPART_RELATED = &#039;multipart/related&#039;;

    const ENCODING_7BIT = &#039;7bit&#039;;
    const ENCODING_8BIT = &#039;8bit&#039;;
    const ENCODING_BASE64 = &#039;base64&#039;;
    const ENCODING_BINARY = &#039;binary&#039;;
    const ENCODING_QUOTED_PRINTABLE = &#039;quoted-printable&#039;;

    const ENCRYPTION_STARTTLS = &#039;tls&#039;;
    const ENCRYPTION_SMTPS = &#039;ssl&#039;;

    const ICAL_METHOD_REQUEST = &#039;REQUEST&#039;;
    const ICAL_METHOD_PUBLISH = &#039;PUBLISH&#039;;
    const ICAL_METHOD_REPLY = &#039;REPLY&#039;;
    const ICAL_METHOD_ADD = &#039;ADD&#039;;
    const ICAL_METHOD_CANCEL = &#039;CANCEL&#039;;
    const ICAL_METHOD_REFRESH = &#039;REFRESH&#039;;
    const ICAL_METHOD_COUNTER = &#039;COUNTER&#039;;
    const ICAL_METHOD_DECLINECOUNTER = &#039;DECLINECOUNTER&#039;;

    /**
     * Email priority.
     * Options: null (default), 1 = High, 3 = Normal, 5 = low.
     * When null, the header is not set at all.
     *
     * @var int|null
     */
    public $Priority;

    /**
     * The character set of the message.
     *
     * @var string
     */
    public $CharSet = self::CHARSET_ISO88591;

    /**
     * The MIME Content-type of the message.
     *
     * @var string
     */
    public $ContentType = self::CONTENT_TYPE_PLAINTEXT;

    /**
     * The message encoding.
     * Options: &quot;8bit&quot;, &quot;7bit&quot;, &quot;binary&quot;, &quot;base64&quot;, and &quot;quoted-printable&quot;.
     *
     * @var string
     */
    public $Encoding = self::ENCODING_8BIT;

    /**
     * Holds the most recent mailer error message.
     *
     * @var string
     */
    public $ErrorInfo = &#039;&#039;;

    /**
     * The From email address for the message.
     *
     * @var string
     */
    public $From = &#039;&#039;;

    /**
     * The From name of the message.
     *
     * @var string
     */
    public $FromName = &#039;&#039;;

    /**
     * The envelope sender of the message.
     * This will usually be turned into a Return-Path header by the receiver,
     * and is the address that bounces will be sent to.
     * If not empty, will be passed via `-f` to sendmail or as the &#039;MAIL FROM&#039; value over SMTP.
     *
     * @var string
     */
    public $Sender = &#039;&#039;;

    /**
     * The Subject of the message.
     *
     * @var string
     */
    public $Subject = &#039;&#039;;

    /**
     * An HTML or plain text message body.
     * If HTML then call isHTML(true).
     *
     * @var string
     */
    public $Body = &#039;&#039;;

    /**
     * The plain-text message body.
     * This body can be read by mail clients that do not have HTML email
     * capability such as mutt &amp; Eudora.
     * Clients that can read HTML will view the normal Body.
     *
     * @var string
     */
    public $AltBody = &#039;&#039;;

    /**
     * An iCal message part body.
     * Only supported in simple alt or alt_inline message types
     * To generate iCal event structures, use classes like EasyPeasyICS or iCalcreator.
     *
     * @see https://kigkonsult.se/iCalcreator/
     *
     * @var string
     */
    public $Ical = &#039;&#039;;

    /**
     * Value-array of &quot;method&quot; in Contenttype header &quot;text/calendar&quot;
     *
     * @var string[]
     */
    protected static $IcalMethods = [
        self::ICAL_METHOD_REQUEST,
        self::ICAL_METHOD_PUBLISH,
        self::ICAL_METHOD_REPLY,
        self::ICAL_METHOD_ADD,
        self::ICAL_METHOD_CANCEL,
        self::ICAL_METHOD_REFRESH,
        self::ICAL_METHOD_COUNTER,
        self::ICAL_METHOD_DECLINECOUNTER,
    ];

    /**
     * The complete compiled MIME message body.
     *
     * @var string
     */
    protected $MIMEBody = &#039;&#039;;

    /**
     * The complete compiled MIME message headers.
     *
     * @var string
     */
    protected $MIMEHeader = &#039;&#039;;

    /**
     * Extra headers that createHeader() doesn&#039;t fold in.
     *
     * @var string
     */
    protected $mailHeader = &#039;&#039;;

    /**
     * Word-wrap the message body to this number of chars.
     * Set to 0 to not wrap. A useful value here is 78, for RFC2822 section 2.1.1 compliance.
     *
     * @see static::STD_LINE_LENGTH
     *
     * @var int
     */
    public $WordWrap = 0;

    /**
     * Which method to use to send mail.
     * Options: &quot;mail&quot;, &quot;sendmail&quot;, or &quot;smtp&quot;.
     *
     * @var string
     */
    public $Mailer = &#039;mail&#039;;

    /**
     * The path to the sendmail program.
     *
     * @var string
     */
    public $Sendmail = &#039;/usr/sbin/sendmail&#039;;

    /**
     * Whether mail() uses a fully sendmail-compatible MTA.
     * One which supports sendmail&#039;s &quot;-oi -f&quot; options.
     *
     * @var bool
     */
    public $UseSendmailOptions = true;

    /**
     * The email address that a reading confirmation should be sent to, also known as read receipt.
     *
     * @var string
     */
    public $ConfirmReadingTo = &#039;&#039;;

    /**
     * The hostname to use in the Message-ID header and as default HELO string.
     * If empty, PHPMailer attempts to find one with, in order,
     * $_SERVER[&#039;SERVER_NAME&#039;], gethostname(), php_uname(&#039;n&#039;), or the value
     * &#039;localhost.localdomain&#039;.
     *
     * @see PHPMailer::$Helo
     *
     * @var string
     */
    public $Hostname = &#039;&#039;;

    /**
     * An ID to be used in the Message-ID header.
     * If empty, a unique id will be generated.
     * You can set your own, but it must be in the format &quot;&lt;id@domain&gt;&quot;,
     * as defined in RFC5322 section 3.6.4 or it will be ignored.
     *
     * @see https://www.rfc-editor.org/rfc/rfc5322#section-3.6.4
     *
     * @var string
     */
    public $MessageID = &#039;&#039;;

    /**
     * The message Date to be used in the Date header.
     * If empty, the current date will be added.
     *
     * @var string
     */
    public $MessageDate = &#039;&#039;;

    /**
     * SMTP hosts.
     * Either a single hostname or multiple semicolon-delimited hostnames.
     * You can also specify a different port
     * for each host by using this format: [hostname:port]
     * (e.g. &quot;smtp1.example.com:25;smtp2.example.com&quot;).
     * You can also specify encryption type, for example:
     * (e.g. &quot;tls://smtp1.example.com:587;ssl://smtp2.example.com:465&quot;).
     * Hosts will be tried in order.
     *
     * @var string
     */
    public $Host = &#039;localhost&#039;;

    /**
     * The default SMTP server port.
     *
     * @var int
     */
    public $Port = 25;

    /**
     * The SMTP HELO/EHLO name used for the SMTP connection.
     * Default is $Hostname. If $Hostname is empty, PHPMailer attempts to find
     * one with the same method described above for $Hostname.
     *
     * @see PHPMailer::$Hostname
     *
     * @var string
     */
    public $Helo = &#039;&#039;;

    /**
     * What kind of encryption to use on the SMTP connection.
     * Options: &#039;&#039;, static::ENCRYPTION_STARTTLS, or static::ENCRYPTION_SMTPS.
     *
     * @var string
     */
    public $SMTPSecure = &#039;&#039;;

    /**
     * Whether to enable TLS encryption automatically if a server supports it,
     * even if `SMTPSecure` is not set to &#039;tls&#039;.
     * Be aware that in PHP &gt;= 5.6 this requires that the server&#039;s certificates are valid.
     *
     * @var bool
     */
    public $SMTPAutoTLS = true;

    /**
     * Whether to use SMTP authentication.
     * Uses the Username and Password properties.
     *
     * @see PHPMailer::$Username
     * @see PHPMailer::$Password
     *
     * @var bool
     */
    public $SMTPAuth = false;

    /**
     * Options array passed to stream_context_create when connecting via SMTP.
     *
     * @var array
     */
    public $SMTPOptions = [];

    /**
     * SMTP username.
     *
     * @var string
     */
    public $Username = &#039;&#039;;

    /**
     * SMTP password.
     *
     * @var string
     */
    public $Password = &#039;&#039;;

    /**
     * SMTP authentication type. Options are CRAM-MD5, LOGIN, PLAIN, XOAUTH2.
     * If not specified, the first one from that list that the server supports will be selected.
     *
     * @var string
     */
    public $AuthType = &#039;&#039;;

    /**
     * SMTP SMTPXClient command attributes
     *
     * @var array
     */
    protected $SMTPXClient = [];

    /**
     * An implementation of the PHPMailer OAuthTokenProvider interface.
     *
     * @var OAuthTokenProvider
     */
    protected $oauth;

    /**
     * The SMTP server timeout in seconds.
     * Default of 5 minutes (300sec) is from RFC2821 section 4.5.3.2.
     *
     * @var int
     */
    public $Timeout = 300;

    /**
     * Comma separated list of DSN notifications
     * &#039;NEVER&#039; under no circumstances a DSN must be returned to the sender.
     *         If you use NEVER all other notifications will be ignored.
     * &#039;SUCCESS&#039; will notify you when your mail has arrived at its destination.
     * &#039;FAILURE&#039; will arrive if an error occurred during delivery.
     * &#039;DELAY&#039;   will notify you if there is an unusual delay in delivery, but the actual
     *           delivery&#039;s outcome (success or failure) is not yet decided.
     *
     * @see https://www.rfc-editor.org/rfc/rfc3461.html#section-4.1 for more information about NOTIFY
     */
    public $dsn = &#039;&#039;;

    /**
     * SMTP class debug output mode.
     * Debug output level.
     * Options:
     * @see SMTP::DEBUG_OFF: No output
     * @see SMTP::DEBUG_CLIENT: Client messages
     * @see SMTP::DEBUG_SERVER: Client and server messages
     * @see SMTP::DEBUG_CONNECTION: As SERVER plus connection status
     * @see SMTP::DEBUG_LOWLEVEL: Noisy, low-level data output, rarely needed
     *
     * @see SMTP::$do_debug
     *
     * @var int
     */
    public $SMTPDebug = 0;

    /**
     * How to handle debug output.
     * Options:
     * * `echo` Output plain-text as-is, appropriate for CLI
     * * `html` Output escaped, line breaks converted to `&lt;br&gt;`, appropriate for browser output
     * * `error_log` Output to error log as configured in php.ini
     * By default PHPMailer will use `echo` if run from a `cli` or `cli-server` SAPI, `html` otherwise.
     * Alternatively, you can provide a callable expecting two params: a message string and the debug level:
     *
     * ```php
     * $mail-&gt;Debugoutput = function($str, $level) {echo &quot;debug level $level; message: $str&quot;;};
     * ```
     *
     * Alternatively, you can pass in an instance of a PSR-3 compatible logger, though only `debug`
     * level output is used:
     *
     * ```php
     * $mail-&gt;Debugoutput = new myPsr3Logger;
     * ```
     *
     * @see SMTP::$Debugoutput
     *
     * @var string|callable|\Psr\Log\LoggerInterface
     */
    public $Debugoutput = &#039;echo&#039;;

    /**
     * Whether to keep the SMTP connection open after each message.
     * If this is set to true then the connection will remain open after a send,
     * and closing the connection will require an explicit call to smtpClose().
     * It&#039;s a good idea to use this if you are sending multiple messages as it reduces overhead.
     * See the mailing list example for how to use it.
     *
     * @var bool
     */
    public $SMTPKeepAlive = false;

    /**
     * Whether to split multiple to addresses into multiple messages
     * or send them all in one message.
     * Only supported in `mail` and `sendmail` transports, not in SMTP.
     *
     * @var bool
     *
     * @deprecated 6.0.0 PHPMailer isn&#039;t a mailing list manager!
     */
    public $SingleTo = false;

    /**
     * Storage for addresses when SingleTo is enabled.
     *
     * @var array
     */
    protected $SingleToArray = [];

    /**
     * Whether to generate VERP addresses on send.
     * Only applicable when sending via SMTP.
     *
     * @see https://en.wikipedia.org/wiki/Variable_envelope_return_path
     * @see https://www.postfix.org/VERP_README.html Postfix VERP info
     *
     * @var bool
     */
    public $do_verp = false;

    /**
     * Whether to allow sending messages with an empty body.
     *
     * @var bool
     */
    public $AllowEmpty = false;

    /**
     * DKIM selector.
     *
     * @var string
     */
    public $DKIM_selector = &#039;&#039;;

    /**
     * DKIM Identity.
     * Usually the email address used as the source of the email.
     *
     * @var string
     */
    public $DKIM_identity = &#039;&#039;;

    /**
     * DKIM passphrase.
     * Used if your key is encrypted.
     *
     * @var string
     */
    public $DKIM_passphrase = &#039;&#039;;

    /**
     * DKIM signing domain name.
     *
     * @example &#039;example.com&#039;
     *
     * @var string
     */
    public $DKIM_domain = &#039;&#039;;

    /**
     * DKIM Copy header field values for diagnostic use.
     *
     * @var bool
     */
    public $DKIM_copyHeaderFields = true;

    /**
     * DKIM Extra signing headers.
     *
     * @example [&#039;List-Unsubscribe&#039;, &#039;List-Help&#039;]
     *
     * @var array
     */
    public $DKIM_extraHeaders = [];

    /**
     * DKIM private key file path.
     *
     * @var string
     */
    public $DKIM_private = &#039;&#039;;

    /**
     * DKIM private key string.
     *
     * If set, takes precedence over `$DKIM_private`.
     *
     * @var string
     */
    public $DKIM_private_string = &#039;&#039;;

    /**
     * Callback Action function name.
     *
     * The function that handles the result of the send email action.
     * It is called out by send() for each email sent.
     *
     * Value can be any php callable: https://www.php.net/is_callable
     *
     * Parameters:
     *   bool $result           result of the send action
     *   array   $to            email addresses of the recipients
     *   array   $cc            cc email addresses
     *   array   $bcc           bcc email addresses
     *   string  $subject       the subject
     *   string  $body          the email body
     *   string  $from          email address of sender
     *   string  $extra         extra information of possible use
     *                          &quot;smtp_transaction_id&#039; =&gt; last smtp transaction id
     *
     * @var string
     */
    public $action_function = &#039;&#039;;

    /**
     * What to put in the X-Mailer header.
     * Options: An empty string for PHPMailer default, whitespace/null for none, or a string to use.
     *
     * @var string|null
     */
    public $XMailer = &#039;&#039;;

    /**
     * Which validator to use by default when validating email addresses.
     * May be a callable to inject your own validator, but there are several built-in validators.
     * The default validator uses PHP&#039;s FILTER_VALIDATE_EMAIL filter_var option.
     *
     * @see PHPMailer::validateAddress()
     *
     * @var string|callable
     */
    public static $validator = &#039;php&#039;;

    /**
     * An instance of the SMTP sender class.
     *
     * @var SMTP
     */
    protected $smtp;

    /**
     * The array of &#039;to&#039; names and addresses.
     *
     * @var array
     */
    protected $to = [];

    /**
     * The array of &#039;cc&#039; names and addresses.
     *
     * @var array
     */
    protected $cc = [];

    /**
     * The array of &#039;bcc&#039; names and addresses.
     *
     * @var array
     */
    protected $bcc = [];

    /**
     * The array of reply-to names and addresses.
     *
     * @var array
     */
    protected $ReplyTo = [];

    /**
     * An array of all kinds of addresses.
     * Includes all of $to, $cc, $bcc.
     *
     * @see PHPMailer::$to
     * @see PHPMailer::$cc
     * @see PHPMailer::$bcc
     *
     * @var array
     */
    protected $all_recipients = [];

    /**
     * An array of names and addresses queued for validation.
     * In send(), valid and non duplicate entries are moved to $all_recipients
     * and one of $to, $cc, or $bcc.
     * This array is used only for addresses with IDN.
     *
     * @see PHPMailer::$to
     * @see PHPMailer::$cc
     * @see PHPMailer::$bcc
     * @see PHPMailer::$all_recipients
     *
     * @var array
     */
    protected $RecipientsQueue = [];

    /**
     * An array of reply-to names and addresses queued for validation.
     * In send(), valid and non duplicate entries are moved to $ReplyTo.
     * This array is used only for addresses with IDN.
     *
     * @see PHPMailer::$ReplyTo
     *
     * @var array
     */
    protected $ReplyToQueue = [];

    /**
     * The array of attachments.
     *
     * @var array
     */
    protected $attachment = [];

    /**
     * The array of custom headers.
     *
     * @var array
     */
    protected $CustomHeader = [];

    /**
     * The most recent Message-ID (including angular brackets).
     *
     * @var string
     */
    protected $lastMessageID = &#039;&#039;;

    /**
     * The message&#039;s MIME type.
     *
     * @var string
     */
    protected $message_type = &#039;&#039;;

    /**
     * The array of MIME boundary strings.
     *
     * @var array
     */
    protected $boundary = [];

    /**
     * The array of available text strings for the current language.
     *
     * @var array
     */
    protected $language = [];

    /**
     * The number of errors encountered.
     *
     * @var int
     */
    protected $error_count = 0;

    /**
     * The S/MIME certificate file path.
     *
     * @var string
     */
    protected $sign_cert_file = &#039;&#039;;

    /**
     * The S/MIME key file path.
     *
     * @var string
     */
    protected $sign_key_file = &#039;&#039;;

    /**
     * The optional S/MIME extra certificates (&quot;CA Chain&quot;) file path.
     *
     * @var string
     */
    protected $sign_extracerts_file = &#039;&#039;;

    /**
     * The S/MIME password for the key.
     * Used only if the key is encrypted.
     *
     * @var string
     */
    protected $sign_key_pass = &#039;&#039;;

    /**
     * Whether to throw exceptions for errors.
     *
     * @var bool
     */
    protected $exceptions = false;

    /**
     * Unique ID used for message ID and boundaries.
     *
     * @var string
     */
    protected $uniqueid = &#039;&#039;;

    /**
     * The PHPMailer Version number.
     *
     * @var string
     */
    const VERSION = &#039;6.9.3&#039;;

    /**
     * Error severity: message only, continue processing.
     *
     * @var int
     */
    const STOP_MESSAGE = 0;

    /**
     * Error severity: message, likely ok to continue processing.
     *
     * @var int
     */
    const STOP_CONTINUE = 1;

    /**
     * Error severity: message, plus full stop, critical error reached.
     *
     * @var int
     */
    const STOP_CRITICAL = 2;

    /**
     * The SMTP standard CRLF line break.
     * If you want to change line break format, change static::$LE, not this.
     */
    const CRLF = &quot;\r\n&quot;;

    /**
     * &quot;Folding White Space&quot; a white space string used for line folding.
     */
    const FWS = &#039; &#039;;

    /**
     * SMTP RFC standard line ending; Carriage Return, Line Feed.
     *
     * @var string
     */
    protected static $LE = self::CRLF;

    /**
     * The maximum line length supported by mail().
     *
     * Background: mail() will sometimes corrupt messages
     * with headers longer than 65 chars, see #818.
     *
     * @var int
     */
    const MAIL_MAX_LINE_LENGTH = 63;

    /**
     * The maximum line length allowed by RFC 2822 section 2.1.1.
     *
     * @var int
     */
    const MAX_LINE_LENGTH = 998;

    /**
     * The lower maximum line length allowed by RFC 2822 section 2.1.1.
     * This length does NOT include the line break
     * 76 means that lines will be 77 or 78 chars depending on whether
     * the line break format is LF or CRLF; both are valid.
     *
     * @var int
     */
    const STD_LINE_LENGTH = 76;

    /**
     * Constructor.
     *
     * @param bool $exceptions Should we throw external exceptions?
     */
    public function __construct($exceptions = null)
    {
        if (null !== $exceptions) {
            $this-&gt;exceptions = (bool) $exceptions;
        }
        //Pick an appropriate debug output format automatically
        $this-&gt;Debugoutput = (strpos(PHP_SAPI, &#039;cli&#039;) !== false ? &#039;echo&#039; : &#039;html&#039;);
    }

    /**
     * Destructor.
     */
    public function __destruct()
    {
        //Close any open SMTP connection nicely
        $this-&gt;smtpClose();
    }

    /**
     * Call mail() in a safe_mode-aware fashion.
     * Also, unless sendmail_path points to sendmail (or something that
     * claims to be sendmail), don&#039;t pass params (not a perfect fix,
     * but it will do).
     *
     * @param string      $to      To
     * @param string      $subject Subject
     * @param string      $body    Message Body
     * @param string      $header  Additional Header(s)
     * @param string|null $params  Params
     *
     * @return bool
     */
    private function mailPassthru($to, $subject, $body, $header, $params)
    {
        //Check overloading of mail function to avoid double-encoding
        if ((int)ini_get(&#039;mbstring.func_overload&#039;) &amp; 1) { // phpcs:ignore PHPCompatibility.IniDirectives.RemovedIniDirectives.mbstring_func_overloadDeprecated
            $subject = $this-&gt;secureHeader($subject);
        } else {
            $subject = $this-&gt;encodeHeader($this-&gt;secureHeader($subject));
        }
        //Calling mail() with null params breaks
        $this-&gt;edebug(&#039;Sending with mail()&#039;);
        $this-&gt;edebug(&#039;Sendmail path: &#039; . ini_get(&#039;sendmail_path&#039;));
        $this-&gt;edebug(&quot;Envelope sender: {$this-&gt;Sender}&quot;);
        $this-&gt;edebug(&quot;To: {$to}&quot;);
        $this-&gt;edebug(&quot;Subject: {$subject}&quot;);
        $this-&gt;edebug(&quot;Headers: {$header}&quot;);
        if (!$this-&gt;UseSendmailOptions || null === $params) {
            $result = @mail($to, $subject, $body, $header);
        } else {
            $this-&gt;edebug(&quot;Additional params: {$params}&quot;);
            $result = @mail($to, $subject, $body, $header, $params);
        }
        $this-&gt;edebug(&#039;Result: &#039; . ($result ? &#039;true&#039; : &#039;false&#039;));
        return $result;
    }

    /**
     * Output debugging info via a user-defined method.
     * Only generates output if debug output is enabled.
     *
     * @see PHPMailer::$Debugoutput
     * @see PHPMailer::$SMTPDebug
     *
     * @param string $str
     */
    protected function edebug($str)
    {
        if ($this-&gt;SMTPDebug &lt;= 0) {
            return;
        }
        //Is this a PSR-3 logger?
        if ($this-&gt;Debugoutput instanceof \Psr\Log\LoggerInterface) {
            $this-&gt;Debugoutput-&gt;debug(rtrim($str, &quot;\r\n&quot;));

            return;
        }
        //Avoid clash with built-in function names
        if (is_callable($this-&gt;Debugoutput) &amp;&amp; !in_array($this-&gt;Debugoutput, [&#039;error_log&#039;, &#039;html&#039;, &#039;echo&#039;])) {
            call_user_func($this-&gt;Debugoutput, $str, $this-&gt;SMTPDebug);

            return;
        }
        switch ($this-&gt;Debugoutput) {
            case &#039;error_log&#039;:
                //Don&#039;t output, just log
                /** @noinspection ForgottenDebugOutputInspection */
                error_log($str);
                break;
            case &#039;html&#039;:
                //Cleans up output a bit for a better looking, HTML-safe output
                echo htmlentities(
                    preg_replace(&#039;/[\r\n]+/&#039;, &#039;&#039;, $str),
                    ENT_QUOTES,
                    &#039;UTF-8&#039;
                ), &quot;&lt;br&gt;\n&quot;;
                break;
            case &#039;echo&#039;:
            default:
                //Normalize line breaks
                $str = preg_replace(&#039;/\r\n|\r/m&#039;, &quot;\n&quot;, $str);
                echo gmdate(&#039;Y-m-d H:i:s&#039;),
                &quot;\t&quot;,
                    //Trim trailing space
                trim(
                    //Indent for readability, except for trailing break
                    str_replace(
                        &quot;\n&quot;,
                        &quot;\n                   \t                  &quot;,
                        trim($str)
                    )
                ),
                &quot;\n&quot;;
        }
    }

    /**
     * Sets message type to HTML or plain.
     *
     * @param bool $isHtml True for HTML mode
     */
    public function isHTML($isHtml = true)
    {
        if ($isHtml) {
            $this-&gt;ContentType = static::CONTENT_TYPE_TEXT_HTML;
        } else {
            $this-&gt;ContentType = static::CONTENT_TYPE_PLAINTEXT;
        }
    }

    /**
     * Send messages using SMTP.
     */
    public function isSMTP()
    {
        $this-&gt;Mailer = &#039;smtp&#039;;
    }

    /**
     * Send messages using PHP&#039;s mail() function.
     */
    public function isMail()
    {
        $this-&gt;Mailer = &#039;mail&#039;;
    }

    /**
     * Send messages using $Sendmail.
     */
    public function isSendmail()
    {
        $ini_sendmail_path = ini_get(&#039;sendmail_path&#039;);

        if (false === stripos($ini_sendmail_path, &#039;sendmail&#039;)) {
            $this-&gt;Sendmail = &#039;/usr/sbin/sendmail&#039;;
        } else {
            $this-&gt;Sendmail = $ini_sendmail_path;
        }
        $this-&gt;Mailer = &#039;sendmail&#039;;
    }

    /**
     * Send messages using qmail.
     */
    public function isQmail()
    {
        $ini_sendmail_path = ini_get(&#039;sendmail_path&#039;);

        if (false === stripos($ini_sendmail_path, &#039;qmail&#039;)) {
            $this-&gt;Sendmail = &#039;/var/qmail/bin/qmail-inject&#039;;
        } else {
            $this-&gt;Sendmail = $ini_sendmail_path;
        }
        $this-&gt;Mailer = &#039;qmail&#039;;
    }

    /**
     * Add a &quot;To&quot; address.
     *
     * @param string $address The email address to send to
     * @param string $name
     *
     * @throws Exception
     *
     * @return bool true on success, false if address already used or invalid in some way
     */
    public function addAddress($address, $name = &#039;&#039;)
    {
        return $this-&gt;addOrEnqueueAnAddress(&#039;to&#039;, $address, $name);
    }

    /**
     * Add a &quot;CC&quot; address.
     *
     * @param string $address The email address to send to
     * @param string $name
     *
     * @throws Exception
     *
     * @return bool true on success, false if address already used or invalid in some way
     */
    public function addCC($address, $name = &#039;&#039;)
    {
        return $this-&gt;addOrEnqueueAnAddress(&#039;cc&#039;, $address, $name);
    }

    /**
     * Add a &quot;BCC&quot; address.
     *
     * @param string $address The email address to send to
     * @param string $name
     *
     * @throws Exception
     *
     * @return bool true on success, false if address already used or invalid in some way
     */
    public function addBCC($address, $name = &#039;&#039;)
    {
        return $this-&gt;addOrEnqueueAnAddress(&#039;bcc&#039;, $address, $name);
    }

    /**
     * Add a &quot;Reply-To&quot; address.
     *
     * @param string $address The email address to reply to
     * @param string $name
     *
     * @throws Exception
     *
     * @return bool true on success, false if address already used or invalid in some way
     */
    public function addReplyTo($address, $name = &#039;&#039;)
    {
        return $this-&gt;addOrEnqueueAnAddress(&#039;Reply-To&#039;, $address, $name);
    }

    /**
     * Add an address to one of the recipient arrays or to the ReplyTo array. Because PHPMailer
     * can&#039;t validate addresses with an IDN without knowing the PHPMailer::$CharSet (that can still
     * be modified after calling this function), addition of such addresses is delayed until send().
     * Addresses that have been added already return false, but do not throw exceptions.
     *
     * @param string $kind    One of &#039;to&#039;, &#039;cc&#039;, &#039;bcc&#039;, or &#039;Reply-To&#039;
     * @param string $address The email address
     * @param string $name    An optional username associated with the address
     *
     * @throws Exception
     *
     * @return bool true on success, false if address already used or invalid in some way
     */
    protected function addOrEnqueueAnAddress($kind, $address, $name)
    {
        $pos = false;
        if ($address !== null) {
            $address = trim($address);
            $pos = strrpos($address, &#039;@&#039;);
        }
        if (false === $pos) {
            //At-sign is missing.
            $error_message = sprintf(
                &#039;%s (%s): %s&#039;,
                $this-&gt;lang(&#039;invalid_address&#039;),
                $kind,
                $address
            );
            $this-&gt;setError($error_message);
            $this-&gt;edebug($error_message);
            if ($this-&gt;exceptions) {
                throw new Exception($error_message);
            }

            return false;
        }
        if ($name !== null &amp;&amp; is_string($name)) {
            $name = trim(preg_replace(&#039;/[\r\n]+/&#039;, &#039;&#039;, $name)); //Strip breaks and trim
        } else {
            $name = &#039;&#039;;
        }
        $params = [$kind, $address, $name];
        //Enqueue addresses with IDN until we know the PHPMailer::$CharSet.
        //Domain is assumed to be whatever is after the last @ symbol in the address
        if (static::idnSupported() &amp;&amp; $this-&gt;has8bitChars(substr($address, ++$pos))) {
            if (&#039;Reply-To&#039; !== $kind) {
                if (!array_key_exists($address, $this-&gt;RecipientsQueue)) {
                    $this-&gt;RecipientsQueue[$address] = $params;

                    return true;
                }
            } elseif (!array_key_exists($address, $this-&gt;ReplyToQueue)) {
                $this-&gt;ReplyToQueue[$address] = $params;

                return true;
            }

            return false;
        }

        //Immediately add standard addresses without IDN.
        return call_user_func_array([$this, &#039;addAnAddress&#039;], $params);
    }

    /**
     * Set the boundaries to use for delimiting MIME parts.
     * If you override this, ensure you set all 3 boundaries to unique values.
     * The default boundaries include a &quot;=_&quot; sequence which cannot occur in quoted-printable bodies,
     * as suggested by https://www.rfc-editor.org/rfc/rfc2045#section-6.7
     *
     * @return void
     */
    public function setBoundaries()
    {
        $this-&gt;uniqueid = $this-&gt;generateId();
        $this-&gt;boundary[1] = &#039;b1=_&#039; . $this-&gt;uniqueid;
        $this-&gt;boundary[2] = &#039;b2=_&#039; . $this-&gt;uniqueid;
        $this-&gt;boundary[3] = &#039;b3=_&#039; . $this-&gt;uniqueid;
    }

    /**
     * Add an address to one of the recipient arrays or to the ReplyTo array.
     * Addresses that have been added already return false, but do not throw exceptions.
     *
     * @param string $kind    One of &#039;to&#039;, &#039;cc&#039;, &#039;bcc&#039;, or &#039;ReplyTo&#039;
     * @param string $address The email address to send, resp. to reply to
     * @param string $name
     *
     * @throws Exception
     *
     * @return bool true on success, false if address already used or invalid in some way
     */
    protected function addAnAddress($kind, $address, $name = &#039;&#039;)
    {
        if (!in_array($kind, [&#039;to&#039;, &#039;cc&#039;, &#039;bcc&#039;, &#039;Reply-To&#039;])) {
            $error_message = sprintf(
                &#039;%s: %s&#039;,
                $this-&gt;lang(&#039;Invalid recipient kind&#039;),
                $kind
            );
            $this-&gt;setError($error_message);
            $this-&gt;edebug($error_message);
            if ($this-&gt;exceptions) {
                throw new Exception($error_message);
            }

            return false;
        }
        if (!static::validateAddress($address)) {
            $error_message = sprintf(
                &#039;%s (%s): %s&#039;,
                $this-&gt;lang(&#039;invalid_address&#039;),
                $kind,
                $address
            );
            $this-&gt;setError($error_message);
            $this-&gt;edebug($error_message);
            if ($this-&gt;exceptions) {
                throw new Exception($error_message);
            }

            return false;
        }
        if (&#039;Reply-To&#039; !== $kind) {
            if (!array_key_exists(strtolower($address), $this-&gt;all_recipients)) {
                $this-&gt;{$kind}[] = [$address, $name];
                $this-&gt;all_recipients[strtolower($address)] = true;

                return true;
            }
        } elseif (!array_key_exists(strtolower($address), $this-&gt;ReplyTo)) {
            $this-&gt;ReplyTo[strtolower($address)] = [$address, $name];

            return true;
        }

        return false;
    }

    /**
     * Parse and validate a string containing one or more RFC822-style comma-separated email addresses
     * of the form &quot;display name &lt;address&gt;&quot; into an array of name/address pairs.
     * Uses the imap_rfc822_parse_adrlist function if the IMAP extension is available.
     * Note that quotes in the name part are removed.
     *
     * @see https://www.andrew.cmu.edu/user/agreen1/testing/mrbs/web/Mail/RFC822.php A more careful implementation
     *
     * @param string $addrstr The address list string
     * @param bool   $useimap Whether to use the IMAP extension to parse the list
     * @param string $charset The charset to use when decoding the address list string.
     *
     * @return array
     */
    public static function parseAddresses($addrstr, $useimap = true, $charset = self::CHARSET_ISO88591)
    {
        $addresses = [];
        if ($useimap &amp;&amp; function_exists(&#039;imap_rfc822_parse_adrlist&#039;)) {
            //Use this built-in parser if it&#039;s available
            $list = imap_rfc822_parse_adrlist($addrstr, &#039;&#039;);
            // Clear any potential IMAP errors to get rid of notices being thrown at end of script.
            imap_errors();
            foreach ($list as $address) {
                if (
                    &#039;.SYNTAX-ERROR.&#039; !== $address-&gt;host &amp;&amp;
                    static::validateAddress($address-&gt;mailbox . &#039;@&#039; . $address-&gt;host)
                ) {
                    //Decode the name part if it&#039;s present and encoded
                    if (
                        property_exists($address, &#039;personal&#039;) &amp;&amp;
                        //Check for a Mbstring constant rather than using extension_loaded, which is sometimes disabled
                        defined(&#039;MB_CASE_UPPER&#039;) &amp;&amp;
                        preg_match(&#039;/^=\?.*\?=$/s&#039;, $address-&gt;personal)
                    ) {
                        $origCharset = mb_internal_encoding();
                        mb_internal_encoding($charset);
                        //Undo any RFC2047-encoded spaces-as-underscores
                        $address-&gt;personal = str_replace(&#039;_&#039;, &#039;=20&#039;, $address-&gt;personal);
                        //Decode the name
                        $address-&gt;personal = mb_decode_mimeheader($address-&gt;personal);
                        mb_internal_encoding($origCharset);
                    }

                    $addresses[] = [
                        &#039;name&#039; =&gt; (property_exists($address, &#039;personal&#039;) ? $address-&gt;personal : &#039;&#039;),
                        &#039;address&#039; =&gt; $address-&gt;mailbox . &#039;@&#039; . $address-&gt;host,
                    ];
                }
            }
        } else {
            //Use this simpler parser
            $list = explode(&#039;,&#039;, $addrstr);
            foreach ($list as $address) {
                $address = trim($address);
                //Is there a separate name part?
                if (strpos($address, &#039;&lt;&#039;) === false) {
                    //No separate name, just use the whole thing
                    if (static::validateAddress($address)) {
                        $addresses[] = [
                            &#039;name&#039; =&gt; &#039;&#039;,
                            &#039;address&#039; =&gt; $address,
                        ];
                    }
                } else {
                    list($name, $email) = explode(&#039;&lt;&#039;, $address);
                    $email = trim(str_replace(&#039;&gt;&#039;, &#039;&#039;, $email));
                    $name = trim($name);
                    if (static::validateAddress($email)) {
                        //Check for a Mbstring constant rather than using extension_loaded, which is sometimes disabled
                        //If this name is encoded, decode it
                        if (defined(&#039;MB_CASE_UPPER&#039;) &amp;&amp; preg_match(&#039;/^=\?.*\?=$/s&#039;, $name)) {
                            $origCharset = mb_internal_encoding();
                            mb_internal_encoding($charset);
                            //Undo any RFC2047-encoded spaces-as-underscores
                            $name = str_replace(&#039;_&#039;, &#039;=20&#039;, $name);
                            //Decode the name
                            $name = mb_decode_mimeheader($name);
                            mb_internal_encoding($origCharset);
                        }
                        $addresses[] = [
                            //Remove any surrounding quotes and spaces from the name
                            &#039;name&#039; =&gt; trim($name, &#039;\&#039;&quot; &#039;),
                            &#039;address&#039; =&gt; $email,
                        ];
                    }
                }
            }
        }

        return $addresses;
    }

    /**
     * Set the From and FromName properties.
     *
     * @param string $address
     * @param string $name
     * @param bool   $auto    Whether to also set the Sender address, defaults to true
     *
     * @throws Exception
     *
     * @return bool
     */
    public function setFrom($address, $name = &#039;&#039;, $auto = true)
    {
        $address = trim((string)$address);
        $name = trim(preg_replace(&#039;/[\r\n]+/&#039;, &#039;&#039;, $name)); //Strip breaks and trim
        //Don&#039;t validate now addresses with IDN. Will be done in send().
        $pos = strrpos($address, &#039;@&#039;);
        if (
            (false === $pos)
            || ((!$this-&gt;has8bitChars(substr($address, ++$pos)) || !static::idnSupported())
            &amp;&amp; !static::validateAddress($address))
        ) {
            $error_message = sprintf(
                &#039;%s (From): %s&#039;,
                $this-&gt;lang(&#039;invalid_address&#039;),
                $address
            );
            $this-&gt;setError($error_message);
            $this-&gt;edebug($error_message);
            if ($this-&gt;exceptions) {
                throw new Exception($error_message);
            }

            return false;
        }
        $this-&gt;From = $address;
        $this-&gt;FromName = $name;
        if ($auto &amp;&amp; empty($this-&gt;Sender)) {
            $this-&gt;Sender = $address;
        }

        return true;
    }

    /**
     * Return the Message-ID header of the last email.
     * Technically this is the value from the last time the headers were created,
     * but it&#039;s also the message ID of the last sent message except in
     * pathological cases.
     *
     * @return string
     */
    public function getLastMessageID()
    {
        return $this-&gt;lastMessageID;
    }

    /**
     * Check that a string looks like an email address.
     * Validation patterns supported:
     * * `auto` Pick best pattern automatically;
     * * `pcre8` Use the squiloople.com pattern, requires PCRE &gt; 8.0;
     * * `pcre` Use old PCRE implementation;
     * * `php` Use PHP built-in FILTER_VALIDATE_EMAIL;
     * * `html5` Use the pattern given by the HTML5 spec for &#039;email&#039; type form input elements.
     * * `noregex` Don&#039;t use a regex: super fast, really dumb.
     * Alternatively you may pass in a callable to inject your own validator, for example:
     *
     * ```php
     * PHPMailer::validateAddress(&#039;user@example.com&#039;, function($address) {
     *     return (strpos($address, &#039;@&#039;) !== false);
     * });
     * ```
     *
     * You can also set the PHPMailer::$validator static to a callable, allowing built-in methods to use your validator.
     *
     * @param string          $address       The email address to check
     * @param string|callable $patternselect Which pattern to use
     *
     * @return bool
     */
    public static function validateAddress($address, $patternselect = null)
    {
        if (null === $patternselect) {
            $patternselect = static::$validator;
        }
        //Don&#039;t allow strings as callables, see SECURITY.md and CVE-2021-3603
        if (is_callable($patternselect) &amp;&amp; !is_string($patternselect)) {
            return call_user_func($patternselect, $address);
        }
        //Reject line breaks in addresses; it&#039;s valid RFC5322, but not RFC5321
        if (strpos($address, &quot;\n&quot;) !== false || strpos($address, &quot;\r&quot;) !== false) {
            return false;
        }
        switch ($patternselect) {
            case &#039;pcre&#039;: //Kept for BC
            case &#039;pcre8&#039;:
                /*
                 * A more complex and more permissive version of the RFC5322 regex on which FILTER_VALIDATE_EMAIL
                 * is based.
                 * In addition to the addresses allowed by filter_var, also permits:
                 *  * dotless domains: `a@b`
                 *  * comments: `1234 @ local(blah) .machine .example`
                 *  * quoted elements: `&#039;&quot;test blah&quot;@example.org&#039;`
                 *  * numeric TLDs: `a@b.123`
                 *  * unbracketed IPv4 literals: `a@192.168.0.1`
                 *  * IPv6 literals: &#039;first.last@[IPv6:a1::]&#039;
                 * Not all of these will necessarily work for sending!
                 *
                 * @copyright 2009-2010 Michael Rushton
                 * Feel free to use and redistribute this code. But please keep this copyright notice.
                 */
                return (bool) preg_match(
                    &#039;/^(?!(?&gt;(?1)&quot;?(?&gt;\\\[ -~]|[^&quot;])&quot;?(?1)){255,})(?!(?&gt;(?1)&quot;?(?&gt;\\\[ -~]|[^&quot;])&quot;?(?1)){65,}@)&#039; .
                    &#039;((?&gt;(?&gt;(?&gt;((?&gt;(?&gt;(?&gt;\x0D\x0A)?[\t ])+|(?&gt;[\t ]*\x0D\x0A)?[\t ]+)?)(\((?&gt;(?2)&#039; .
                    &#039;(?&gt;[\x01-\x08\x0B\x0C\x0E-\&#039;*-\[\]-\x7F]|\\\[\x00-\x7F]|(?3)))*(?2)\)))+(?2))|(?2))?)&#039; .
                    &#039;([!#-\&#039;*+\/-9=?^-~-]+|&quot;(?&gt;(?2)(?&gt;[\x01-\x08\x0B\x0C\x0E-!#-\[\]-\x7F]|\\\[\x00-\x7F]))*&#039; .
                    &#039;(?2)&quot;)(?&gt;(?1)\.(?1)(?4))*(?1)@(?!(?1)[a-z0-9-]{64,})(?1)(?&gt;([a-z0-9](?&gt;[a-z0-9-]*[a-z0-9])?)&#039; .
                    &#039;(?&gt;(?1)\.(?!(?1)[a-z0-9-]{64,})(?1)(?5)){0,126}|\[(?:(?&gt;IPv6:(?&gt;([a-f0-9]{1,4})(?&gt;:(?6)){7}&#039; .
                    &#039;|(?!(?:.*[a-f0-9][:\]]){8,})((?6)(?&gt;:(?6)){0,6})?::(?7)?))|(?&gt;(?&gt;IPv6:(?&gt;(?6)(?&gt;:(?6)){5}:&#039; .
                    &#039;|(?!(?:.*[a-f0-9]:){6,})(?8)?::(?&gt;((?6)(?&gt;:(?6)){0,4}):)?))?(25[0-5]|2[0-4][0-9]|1[0-9]{2}&#039; .
                    &#039;|[1-9]?[0-9])(?&gt;\.(?9)){3}))\])(?1)$/isD&#039;,
                    $address
                );
            case &#039;html5&#039;:
                /*
                 * This is the pattern used in the HTML5 spec for validation of &#039;email&#039; type form input elements.
                 *
                 * @see https://html.spec.whatwg.org/#e-mail-state-(type=email)
                 */
                return (bool) preg_match(
                    &#039;/^[a-zA-Z0-9.!#$%&amp;\&#039;*+\/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}&#039; .
                    &#039;[a-zA-Z0-9])?(?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$/sD&#039;,
                    $address
                );
            case &#039;php&#039;:
            default:
                return filter_var($address, FILTER_VALIDATE_EMAIL) !== false;
        }
    }

    /**
     * Tells whether IDNs (Internationalized Domain Names) are supported or not. This requires the
     * `intl` and `mbstring` PHP extensions.
     *
     * @return bool `true` if required functions for IDN support are present
     */
    public static function idnSupported()
    {
        return function_exists(&#039;idn_to_ascii&#039;) &amp;&amp; function_exists(&#039;mb_convert_encoding&#039;);
    }

    /**
     * Converts IDN in given email address to its ASCII form, also known as punycode, if possible.
     * Important: Address must be passed in same encoding as currently set in PHPMailer::$CharSet.
     * This function silently returns unmodified address if:
     * - No conversion is necessary (i.e. domain name is not an IDN, or is already in ASCII form)
     * - Conversion to punycode is impossible (e.g. required PHP functions are not available)
     *   or fails for any reason (e.g. domain contains characters not allowed in an IDN).
     *
     * @see PHPMailer::$CharSet
     *
     * @param string $address The email address to convert
     *
     * @return string The encoded address in ASCII form
     */
    public function punyencodeAddress($address)
    {
        //Verify we have required functions, CharSet, and at-sign.
        $pos = strrpos($address, &#039;@&#039;);
        if (
            !empty($this-&gt;CharSet) &amp;&amp;
            false !== $pos &amp;&amp;
            static::idnSupported()
        ) {
            $domain = substr($address, ++$pos);
            //Verify CharSet string is a valid one, and domain properly encoded in this CharSet.
            if ($this-&gt;has8bitChars($domain) &amp;&amp; @mb_check_encoding($domain, $this-&gt;CharSet)) {
                //Convert the domain from whatever charset it&#039;s in to UTF-8
                $domain = mb_convert_encoding($domain, self::CHARSET_UTF8, $this-&gt;CharSet);
                //Ignore IDE complaints about this line - method signature changed in PHP 5.4
                $errorcode = 0;
                if (defined(&#039;INTL_IDNA_VARIANT_UTS46&#039;)) {
                    //Use the current punycode standard (appeared in PHP 7.2)
                    $punycode = idn_to_ascii(
                        $domain,
                        \IDNA_DEFAULT | \IDNA_USE_STD3_RULES | \IDNA_CHECK_BIDI |
                            \IDNA_CHECK_CONTEXTJ | \IDNA_NONTRANSITIONAL_TO_ASCII,
                        \INTL_IDNA_VARIANT_UTS46
                    );
                } elseif (defined(&#039;INTL_IDNA_VARIANT_2003&#039;)) {
                    //Fall back to this old, deprecated/removed encoding
                    // phpcs:ignore PHPCompatibility.Constants.RemovedConstants.intl_idna_variant_2003Deprecated
                    $punycode = idn_to_ascii($domain, $errorcode, \INTL_IDNA_VARIANT_2003);
                } else {
                    //Fall back to a default we don&#039;t know about
                    // phpcs:ignore PHPCompatibility.ParameterValues.NewIDNVariantDefault.NotSet
                    $punycode = idn_to_ascii($domain, $errorcode);
                }
                if (false !== $punycode) {
                    return substr($address, 0, $pos) . $punycode;
                }
            }
        }

        return $address;
    }

    /**
     * Create a message and send it.
     * Uses the sending method specified by $Mailer.
     *
     * @throws Exception
     *
     * @return bool false on error - See the ErrorInfo property for details of the error
     */
    public function send()
    {
        try {
            if (!$this-&gt;preSend()) {
                return false;
            }

            return $this-&gt;postSend();
        } catch (Exception $exc) {
            $this-&gt;mailHeader = &#039;&#039;;
            $this-&gt;setError($exc-&gt;getMessage());
            if ($this-&gt;exceptions) {
                throw $exc;
            }

            return false;
        }
    }

    /**
     * Prepare a message for sending.
     *
     * @throws Exception
     *
     * @return bool
     */
    public function preSend()
    {
        if (
            &#039;smtp&#039; === $this-&gt;Mailer
            || (&#039;mail&#039; === $this-&gt;Mailer &amp;&amp; (\PHP_VERSION_ID &gt;= 80000 || stripos(PHP_OS, &#039;WIN&#039;) === 0))
        ) {
            //SMTP mandates RFC-compliant line endings
            //and it&#039;s also used with mail() on Windows
            static::setLE(self::CRLF);
        } else {
            //Maintain backward compatibility with legacy Linux command line mailers
            static::setLE(PHP_EOL);
        }
        //Check for buggy PHP versions that add a header with an incorrect line break
        if (
            &#039;mail&#039; === $this-&gt;Mailer
            &amp;&amp; ((\PHP_VERSION_ID &gt;= 70000 &amp;&amp; \PHP_VERSION_ID &lt; 70017)
                || (\PHP_VERSION_ID &gt;= 70100 &amp;&amp; \PHP_VERSION_ID &lt; 70103))
            &amp;&amp; ini_get(&#039;mail.add_x_header&#039;) === &#039;1&#039;
            &amp;&amp; stripos(PHP_OS, &#039;WIN&#039;) === 0
        ) {
            trigger_error($this-&gt;lang(&#039;buggy_php&#039;), E_USER_WARNING);
        }

        try {
            $this-&gt;error_count = 0; //Reset errors
            $this-&gt;mailHeader = &#039;&#039;;

            //Dequeue recipient and Reply-To addresses with IDN
            foreach (array_merge($this-&gt;RecipientsQueue, $this-&gt;ReplyToQueue) as $params) {
                $params[1] = $this-&gt;punyencodeAddress($params[1]);
                call_user_func_array([$this, &#039;addAnAddress&#039;], $params);
            }
            if (count($this-&gt;to) + count($this-&gt;cc) + count($this-&gt;bcc) &lt; 1) {
                throw new Exception($this-&gt;lang(&#039;provide_address&#039;), self::STOP_CRITICAL);
            }

            //Validate From, Sender, and ConfirmReadingTo addresses
            foreach ([&#039;From&#039;, &#039;Sender&#039;, &#039;ConfirmReadingTo&#039;] as $address_kind) {
                if ($this-&gt;{$address_kind} === null) {
                    $this-&gt;{$address_kind} = &#039;&#039;;
                    continue;
                }
                $this-&gt;{$address_kind} = trim($this-&gt;{$address_kind});
                if (empty($this-&gt;{$address_kind})) {
                    continue;
                }
                $this-&gt;{$address_kind} = $this-&gt;punyencodeAddress($this-&gt;{$address_kind});
                if (!static::validateAddress($this-&gt;{$address_kind})) {
                    $error_message = sprintf(
                        &#039;%s (%s): %s&#039;,
                        $this-&gt;lang(&#039;invalid_address&#039;),
                        $address_kind,
                        $this-&gt;{$address_kind}
                    );
                    $this-&gt;setError($error_message);
                    $this-&gt;edebug($error_message);
                    if ($this-&gt;exceptions) {
                        throw new Exception($error_message);
                    }

                    return false;
                }
            }

            //Set whether the message is multipart/alternative
            if ($this-&gt;alternativeExists()) {
                $this-&gt;ContentType = static::CONTENT_TYPE_MULTIPART_ALTERNATIVE;
            }

            $this-&gt;setMessageType();
            //Refuse to send an empty message unless we are specifically allowing it
            if (!$this-&gt;AllowEmpty &amp;&amp; empty($this-&gt;Body)) {
                throw new Exception($this-&gt;lang(&#039;empty_message&#039;), self::STOP_CRITICAL);
            }

            //Trim subject consistently
            $this-&gt;Subject = trim($this-&gt;Subject);
            //Create body before headers in case body makes changes to headers (e.g. altering transfer encoding)
            $this-&gt;MIMEHeader = &#039;&#039;;
            $this-&gt;MIMEBody = $this-&gt;createBody();
            //createBody may have added some headers, so retain them
            $tempheaders = $this-&gt;MIMEHeader;
            $this-&gt;MIMEHeader = $this-&gt;createHeader();
            $this-&gt;MIMEHeader .= $tempheaders;

            //To capture the complete message when using mail(), create
            //an extra header list which createHeader() doesn&#039;t fold in
            if (&#039;mail&#039; === $this-&gt;Mailer) {
                if (count($this-&gt;to) &gt; 0) {
                    $this-&gt;mailHeader .= $this-&gt;addrAppend(&#039;To&#039;, $this-&gt;to);
                } else {
                    $this-&gt;mailHeader .= $this-&gt;headerLine(&#039;To&#039;, &#039;undisclosed-recipients:;&#039;);
                }
                $this-&gt;mailHeader .= $this-&gt;headerLine(
                    &#039;Subject&#039;,
                    $this-&gt;encodeHeader($this-&gt;secureHeader($this-&gt;Subject))
                );
            }

            //Sign with DKIM if enabled
            if (
                !empty($this-&gt;DKIM_domain)
                &amp;&amp; !empty($this-&gt;DKIM_selector)
                &amp;&amp; (!empty($this-&gt;DKIM_private_string)
                    || (!empty($this-&gt;DKIM_private)
                        &amp;&amp; static::isPermittedPath($this-&gt;DKIM_private)
                        &amp;&amp; file_exists($this-&gt;DKIM_private)
                    )
                )
            ) {
                $header_dkim = $this-&gt;DKIM_Add(
                    $this-&gt;MIMEHeader . $this-&gt;mailHeader,
                    $this-&gt;encodeHeader($this-&gt;secureHeader($this-&gt;Subject)),
                    $this-&gt;MIMEBody
                );
                $this-&gt;MIMEHeader = static::stripTrailingWSP($this-&gt;MIMEHeader) . static::$LE .
                    static::normalizeBreaks($header_dkim) . static::$LE;
            }

            return true;
        } catch (Exception $exc) {
            $this-&gt;setError($exc-&gt;getMessage());
            if ($this-&gt;exceptions) {
                throw $exc;
            }

            return false;
        }
    }

    /**
     * Actually send a message via the selected mechanism.
     *
     * @throws Exception
     *
     * @return bool
     */
    public function postSend()
    {
        try {
            //Choose the mailer and send through it
            switch ($this-&gt;Mailer) {
                case &#039;sendmail&#039;:
                case &#039;qmail&#039;:
                    return $this-&gt;sendmailSend($this-&gt;MIMEHeader, $this-&gt;MIMEBody);
                case &#039;smtp&#039;:
                    return $this-&gt;smtpSend($this-&gt;MIMEHeader, $this-&gt;MIMEBody);
                case &#039;mail&#039;:
                    return $this-&gt;mailSend($this-&gt;MIMEHeader, $this-&gt;MIMEBody);
                default:
                    $sendMethod = $this-&gt;Mailer . &#039;Send&#039;;
                    if (method_exists($this, $sendMethod)) {
                        return $this-&gt;{$sendMethod}($this-&gt;MIMEHeader, $this-&gt;MIMEBody);
                    }

                    return $this-&gt;mailSend($this-&gt;MIMEHeader, $this-&gt;MIMEBody);
            }
        } catch (Exception $exc) {
            $this-&gt;setError($exc-&gt;getMessage());
            $this-&gt;edebug($exc-&gt;getMessage());
            if ($this-&gt;Mailer === &#039;smtp&#039; &amp;&amp; $this-&gt;SMTPKeepAlive == true &amp;&amp; $this-&gt;smtp-&gt;connected()) {
                $this-&gt;smtp-&gt;reset();
            }
            if ($this-&gt;exceptions) {
                throw $exc;
            }
        }

        return false;
    }

    /**
     * Send mail using the $Sendmail program.
     *
     * @see PHPMailer::$Sendmail
     *
     * @param string $header The message headers
     * @param string $body   The message body
     *
     * @throws Exception
     *
     * @return bool
     */
    protected function sendmailSend($header, $body)
    {
        if ($this-&gt;Mailer === &#039;qmail&#039;) {
            $this-&gt;edebug(&#039;Sending with qmail&#039;);
        } else {
            $this-&gt;edebug(&#039;Sending with sendmail&#039;);
        }
        $header = static::stripTrailingWSP($header) . static::$LE . static::$LE;
        //This sets the SMTP envelope sender which gets turned into a return-path header by the receiver
        //A space after `-f` is optional, but there is a long history of its presence
        //causing problems, so we don&#039;t use one
        //Exim docs: https://www.exim.org/exim-html-current/doc/html/spec_html/ch-the_exim_command_line.html
        //Sendmail docs: https://www.sendmail.org/~ca/email/man/sendmail.html
        //Example problem: https://www.drupal.org/node/1057954

        //PHP 5.6 workaround
        $sendmail_from_value = ini_get(&#039;sendmail_from&#039;);
        if (empty($this-&gt;Sender) &amp;&amp; !empty($sendmail_from_value)) {
            //PHP config has a sender address we can use
            $this-&gt;Sender = ini_get(&#039;sendmail_from&#039;);
        }
        //CVE-2016-10033, CVE-2016-10045: Don&#039;t pass -f if characters will be escaped.
        if (!empty($this-&gt;Sender) &amp;&amp; static::validateAddress($this-&gt;Sender) &amp;&amp; self::isShellSafe($this-&gt;Sender)) {
            if ($this-&gt;Mailer === &#039;qmail&#039;) {
                $sendmailFmt = &#039;%s -f%s&#039;;
            } else {
                $sendmailFmt = &#039;%s -oi -f%s -t&#039;;
            }
        } else {
            //allow sendmail to choose a default envelope sender. It may
            //seem preferable to force it to use the From header as with
            //SMTP, but that introduces new problems (see
            //&lt;https://github.com/PHPMailer/PHPMailer/issues/2298&gt;), and
            //it has historically worked this way.
            $sendmailFmt = &#039;%s -oi -t&#039;;
        }

        $sendmail = sprintf($sendmailFmt, escapeshellcmd($this-&gt;Sendmail), $this-&gt;Sender);
        $this-&gt;edebug(&#039;Sendmail path: &#039; . $this-&gt;Sendmail);
        $this-&gt;edebug(&#039;Sendmail command: &#039; . $sendmail);
        $this-&gt;edebug(&#039;Envelope sender: &#039; . $this-&gt;Sender);
        $this-&gt;edebug(&quot;Headers: {$header}&quot;);

        if ($this-&gt;SingleTo) {
            foreach ($this-&gt;SingleToArray as $toAddr) {
                $mail = @popen($sendmail, &#039;w&#039;);
                if (!$mail) {
                    throw new Exception($this-&gt;lang(&#039;execute&#039;) . $this-&gt;Sendmail, self::STOP_CRITICAL);
                }
                $this-&gt;edebug(&quot;To: {$toAddr}&quot;);
                fwrite($mail, &#039;To: &#039; . $toAddr . &quot;\n&quot;);
                fwrite($mail, $header);
                fwrite($mail, $body);
                $result = pclose($mail);
                $addrinfo = static::parseAddresses($toAddr, true, $this-&gt;CharSet);
                $this-&gt;doCallback(
                    ($result === 0),
                    [[$addrinfo[&#039;address&#039;], $addrinfo[&#039;name&#039;]]],
                    $this-&gt;cc,
                    $this-&gt;bcc,
                    $this-&gt;Subject,
                    $body,
                    $this-&gt;From,
                    []
                );
                $this-&gt;edebug(&quot;Result: &quot; . ($result === 0 ? &#039;true&#039; : &#039;false&#039;));
                if (0 !== $result) {
                    throw new Exception($this-&gt;lang(&#039;execute&#039;) . $this-&gt;Sendmail, self::STOP_CRITICAL);
                }
            }
        } else {
            $mail = @popen($sendmail, &#039;w&#039;);
            if (!$mail) {
                throw new Exception($this-&gt;lang(&#039;execute&#039;) . $this-&gt;Sendmail, self::STOP_CRITICAL);
            }
            fwrite($mail, $header);
            fwrite($mail, $body);
            $result = pclose($mail);
            $this-&gt;doCallback(
                ($result === 0),
                $this-&gt;to,
                $this-&gt;cc,
                $this-&gt;bcc,
                $this-&gt;Subject,
                $body,
                $this-&gt;From,
                []
            );
            $this-&gt;edebug(&quot;Result: &quot; . ($result === 0 ? &#039;true&#039; : &#039;false&#039;));
            if (0 !== $result) {
                throw new Exception($this-&gt;lang(&#039;execute&#039;) . $this-&gt;Sendmail, self::STOP_CRITICAL);
            }
        }

        return true;
    }

    /**
     * Fix CVE-2016-10033 and CVE-2016-10045 by disallowing potentially unsafe shell characters.
     * Note that escapeshellarg and escapeshellcmd are inadequate for our purposes, especially on Windows.
     *
     * @see https://github.com/PHPMailer/PHPMailer/issues/924 CVE-2016-10045 bug report
     *
     * @param string $string The string to be validated
     *
     * @return bool
     */
    protected static function isShellSafe($string)
    {
        //It&#039;s not possible to use shell commands safely (which includes the mail() function) without escapeshellarg,
        //but some hosting providers disable it, creating a security problem that we don&#039;t want to have to deal with,
        //so we don&#039;t.
        if (!function_exists(&#039;escapeshellarg&#039;) || !function_exists(&#039;escapeshellcmd&#039;)) {
            return false;
        }

        if (
            escapeshellcmd($string) !== $string
            || !in_array(escapeshellarg($string), [&quot;&#039;$string&#039;&quot;, &quot;\&quot;$string\&quot;&quot;])
        ) {
            return false;
        }

        $length = strlen($string);

        for ($i = 0; $i &lt; $length; ++$i) {
            $c = $string[$i];

            //All other characters have a special meaning in at least one common shell, including = and +.
            //Full stop (.) has a special meaning in cmd.exe, but its impact should be negligible here.
            //Note that this does permit non-Latin alphanumeric characters based on the current locale.
            if (!ctype_alnum($c) &amp;&amp; strpos(&#039;@_-.&#039;, $c) === false) {
                return false;
            }
        }

        return true;
    }

    /**
     * Check whether a file path is of a permitted type.
     * Used to reject URLs and phar files from functions that access local file paths,
     * such as addAttachment.
     *
     * @param string $path A relative or absolute path to a file
     *
     * @return bool
     */
    protected static function isPermittedPath($path)
    {
        //Matches scheme definition from https://www.rfc-editor.org/rfc/rfc3986#section-3.1
        return !preg_match(&#039;#^[a-z][a-z\d+.-]*://#i&#039;, $path);
    }

    /**
     * Check whether a file path is safe, accessible, and readable.
     *
     * @param string $path A relative or absolute path to a file
     *
     * @return bool
     */
    protected static function fileIsAccessible($path)
    {
        if (!static::isPermittedPath($path)) {
            return false;
        }
        $readable = is_file($path);
        //If not a UNC path (expected to start with \\), check read permission, see #2069
        if (strpos($path, &#039;\\\\&#039;) !== 0) {
            $readable = $readable &amp;&amp; is_readable($path);
        }
        return  $readable;
    }

    /**
     * Send mail using the PHP mail() function.
     *
     * @see https://www.php.net/manual/en/book.mail.php
     *
     * @param string $header The message headers
     * @param string $body   The message body
     *
     * @throws Exception
     *
     * @return bool
     */
    protected function mailSend($header, $body)
    {
        $header = static::stripTrailingWSP($header) . static::$LE . static::$LE;

        $toArr = [];
        foreach ($this-&gt;to as $toaddr) {
            $toArr[] = $this-&gt;addrFormat($toaddr);
        }
        $to = trim(implode(&#039;, &#039;, $toArr));

        //If there are no To-addresses (e.g. when sending only to BCC-addresses)
        //the following should be added to get a correct DKIM-signature.
        //Compare with $this-&gt;preSend()
        if ($to === &#039;&#039;) {
            $to = &#039;undisclosed-recipients:;&#039;;
        }

        $params = null;
        //This sets the SMTP envelope sender which gets turned into a return-path header by the receiver
        //A space after `-f` is optional, but there is a long history of its presence
        //causing problems, so we don&#039;t use one
        //Exim docs: https://www.exim.org/exim-html-current/doc/html/spec_html/ch-the_exim_command_line.html
        //Sendmail docs: https://www.sendmail.org/~ca/email/man/sendmail.html
        //Example problem: https://www.drupal.org/node/1057954
        //CVE-2016-10033, CVE-2016-10045: Don&#039;t pass -f if characters will be escaped.

        //PHP 5.6 workaround
        $sendmail_from_value = ini_get(&#039;sendmail_from&#039;);
        if (empty($this-&gt;Sender) &amp;&amp; !empty($sendmail_from_value)) {
            //PHP config has a sender address we can use
            $this-&gt;Sender = ini_get(&#039;sendmail_from&#039;);
        }
        if (!empty($this-&gt;Sender) &amp;&amp; static::validateAddress($this-&gt;Sender)) {
            if (self::isShellSafe($this-&gt;Sender)) {
                $params = sprintf(&#039;-f%s&#039;, $this-&gt;Sender);
            }
            $old_from = ini_get(&#039;sendmail_from&#039;);
            ini_set(&#039;sendmail_from&#039;, $this-&gt;Sender);
        }
        $result = false;
        if ($this-&gt;SingleTo &amp;&amp; count($toArr) &gt; 1) {
            foreach ($toArr as $toAddr) {
                $result = $this-&gt;mailPassthru($toAddr, $this-&gt;Subject, $body, $header, $params);
                $addrinfo = static::parseAddresses($toAddr, true, $this-&gt;CharSet);
                $this-&gt;doCallback(
                    $result,
                    [[$addrinfo[&#039;address&#039;], $addrinfo[&#039;name&#039;]]],
                    $this-&gt;cc,
                    $this-&gt;bcc,
                    $this-&gt;Subject,
                    $body,
                    $this-&gt;From,
                    []
                );
            }
        } else {
            $result = $this-&gt;mailPassthru($to, $this-&gt;Subject, $body, $header, $params);
            $this-&gt;doCallback($result, $this-&gt;to, $this-&gt;cc, $this-&gt;bcc, $this-&gt;Subject, $body, $this-&gt;From, []);
        }
        if (isset($old_from)) {
            ini_set(&#039;sendmail_from&#039;, $old_from);
        }
        if (!$result) {
            throw new Exception($this-&gt;lang(&#039;instantiate&#039;), self::STOP_CRITICAL);
        }

        return true;
    }

    /**
     * Get an instance to use for SMTP operations.
     * Override this function to load your own SMTP implementation,
     * or set one with setSMTPInstance.
     *
     * @return SMTP
     */
    public function getSMTPInstance()
    {
        if (!is_object($this-&gt;smtp)) {
            $this-&gt;smtp = new SMTP();
        }

        return $this-&gt;smtp;
    }

    /**
     * Provide an instance to use for SMTP operations.
     *
     * @return SMTP
     */
    public function setSMTPInstance(SMTP $smtp)
    {
        $this-&gt;smtp = $smtp;

        return $this-&gt;smtp;
    }

    /**
     * Provide SMTP XCLIENT attributes
     *
     * @param string $name  Attribute name
     * @param ?string $value Attribute value
     *
     * @return bool
     */
    public function setSMTPXclientAttribute($name, $value)
    {
        if (!in_array($name, SMTP::$xclient_allowed_attributes)) {
            return false;
        }
        if (isset($this-&gt;SMTPXClient[$name]) &amp;&amp; $value === null) {
            unset($this-&gt;SMTPXClient[$name]);
        } elseif ($value !== null) {
            $this-&gt;SMTPXClient[$name] = $value;
        }

        return true;
    }

    /**
     * Get SMTP XCLIENT attributes
     *
     * @return array
     */
    public function getSMTPXclientAttributes()
    {
        return $this-&gt;SMTPXClient;
    }

    /**
     * Send mail via SMTP.
     * Returns false if there is a bad MAIL FROM, RCPT, or DATA input.
     *
     * @see PHPMailer::setSMTPInstance() to use a different class.
     *
     * @uses \PHPMailer\PHPMailer\SMTP
     *
     * @param string $header The message headers
     * @param string $body   The message body
     *
     * @throws Exception
     *
     * @return bool
     */
    protected function smtpSend($header, $body)
    {
        $header = static::stripTrailingWSP($header) . static::$LE . static::$LE;
        $bad_rcpt = [];
        if (!$this-&gt;smtpConnect($this-&gt;SMTPOptions)) {
            throw new Exception($this-&gt;lang(&#039;smtp_connect_failed&#039;), self::STOP_CRITICAL);
        }
        //Sender already validated in preSend()
        if (&#039;&#039; === $this-&gt;Sender) {
            $smtp_from = $this-&gt;From;
        } else {
            $smtp_from = $this-&gt;Sender;
        }
        if (count($this-&gt;SMTPXClient)) {
            $this-&gt;smtp-&gt;xclient($this-&gt;SMTPXClient);
        }
        if (!$this-&gt;smtp-&gt;mail($smtp_from)) {
            $this-&gt;setError($this-&gt;lang(&#039;from_failed&#039;) . $smtp_from . &#039; : &#039; . implode(&#039;,&#039;, $this-&gt;smtp-&gt;getError()));
            throw new Exception($this-&gt;ErrorInfo, self::STOP_CRITICAL);
        }

        $callbacks = [];
        //Attempt to send to all recipients
        foreach ([$this-&gt;to, $this-&gt;cc, $this-&gt;bcc] as $togroup) {
            foreach ($togroup as $to) {
                if (!$this-&gt;smtp-&gt;recipient($to[0], $this-&gt;dsn)) {
                    $error = $this-&gt;smtp-&gt;getError();
                    $bad_rcpt[] = [&#039;to&#039; =&gt; $to[0], &#039;error&#039; =&gt; $error[&#039;detail&#039;]];
                    $isSent = false;
                } else {
                    $isSent = true;
                }

                $callbacks[] = [&#039;issent&#039; =&gt; $isSent, &#039;to&#039; =&gt; $to[0], &#039;name&#039; =&gt; $to[1]];
            }
        }

        //Only send the DATA command if we have viable recipients
        if ((count($this-&gt;all_recipients) &gt; count($bad_rcpt)) &amp;&amp; !$this-&gt;smtp-&gt;data($header . $body)) {
            throw new Exception($this-&gt;lang(&#039;data_not_accepted&#039;), self::STOP_CRITICAL);
        }

        $smtp_transaction_id = $this-&gt;smtp-&gt;getLastTransactionID();

        if ($this-&gt;SMTPKeepAlive) {
            $this-&gt;smtp-&gt;reset();
        } else {
            $this-&gt;smtp-&gt;quit();
            $this-&gt;smtp-&gt;close();
        }

        foreach ($callbacks as $cb) {
            $this-&gt;doCallback(
                $cb[&#039;issent&#039;],
                [[$cb[&#039;to&#039;], $cb[&#039;name&#039;]]],
                [],
                [],
                $this-&gt;Subject,
                $body,
                $this-&gt;From,
                [&#039;smtp_transaction_id&#039; =&gt; $smtp_transaction_id]
            );
        }

        //Create error message for any bad addresses
        if (count($bad_rcpt) &gt; 0) {
            $errstr = &#039;&#039;;
            foreach ($bad_rcpt as $bad) {
                $errstr .= $bad[&#039;to&#039;] . &#039;: &#039; . $bad[&#039;error&#039;];
            }
            throw new Exception($this-&gt;lang(&#039;recipients_failed&#039;) . $errstr, self::STOP_CONTINUE);
        }

        return true;
    }

    /**
     * Initiate a connection to an SMTP server.
     * Returns false if the operation failed.
     *
     * @param array $options An array of options compatible with stream_context_create()
     *
     * @throws Exception
     *
     * @uses \PHPMailer\PHPMailer\SMTP
     *
     * @return bool
     */
    public function smtpConnect($options = null)
    {
        if (null === $this-&gt;smtp) {
            $this-&gt;smtp = $this-&gt;getSMTPInstance();
        }

        //If no options are provided, use whatever is set in the instance
        if (null === $options) {
            $options = $this-&gt;SMTPOptions;
        }

        //Already connected?
        if ($this-&gt;smtp-&gt;connected()) {
            return true;
        }

        $this-&gt;smtp-&gt;setTimeout($this-&gt;Timeout);
        $this-&gt;smtp-&gt;setDebugLevel($this-&gt;SMTPDebug);
        $this-&gt;smtp-&gt;setDebugOutput($this-&gt;Debugoutput);
        $this-&gt;smtp-&gt;setVerp($this-&gt;do_verp);
        if ($this-&gt;Host === null) {
            $this-&gt;Host = &#039;localhost&#039;;
        }
        $hosts = explode(&#039;;&#039;, $this-&gt;Host);
        $lastexception = null;

        foreach ($hosts as $hostentry) {
            $hostinfo = [];
            if (
                !preg_match(
                    &#039;/^(?:(ssl|tls):\/\/)?(.+?)(?::(\d+))?$/&#039;,
                    trim($hostentry),
                    $hostinfo
                )
            ) {
                $this-&gt;edebug($this-&gt;lang(&#039;invalid_hostentry&#039;) . &#039; &#039; . trim($hostentry));
                //Not a valid host entry
                continue;
            }
            //$hostinfo[1]: optional ssl or tls prefix
            //$hostinfo[2]: the hostname
            //$hostinfo[3]: optional port number
            //The host string prefix can temporarily override the current setting for SMTPSecure
            //If it&#039;s not specified, the default value is used

            //Check the host name is a valid name or IP address before trying to use it
            if (!static::isValidHost($hostinfo[2])) {
                $this-&gt;edebug($this-&gt;lang(&#039;invalid_host&#039;) . &#039; &#039; . $hostinfo[2]);
                continue;
            }
            $prefix = &#039;&#039;;
            $secure = $this-&gt;SMTPSecure;
            $tls = (static::ENCRYPTION_STARTTLS === $this-&gt;SMTPSecure);
            if (&#039;ssl&#039; === $hostinfo[1] || (&#039;&#039; === $hostinfo[1] &amp;&amp; static::ENCRYPTION_SMTPS === $this-&gt;SMTPSecure)) {
                $prefix = &#039;ssl://&#039;;
                $tls = false; //Can&#039;t have SSL and TLS at the same time
                $secure = static::ENCRYPTION_SMTPS;
            } elseif (&#039;tls&#039; === $hostinfo[1]) {
                $tls = true;
                //TLS doesn&#039;t use a prefix
                $secure = static::ENCRYPTION_STARTTLS;
            }
            //Do we need the OpenSSL extension?
            $sslext = defined(&#039;OPENSSL_ALGO_SHA256&#039;);
            if (static::ENCRYPTION_STARTTLS === $secure || static::ENCRYPTION_SMTPS === $secure) {
                //Check for an OpenSSL constant rather than using extension_loaded, which is sometimes disabled
                if (!$sslext) {
                    throw new Exception($this-&gt;lang(&#039;extension_missing&#039;) . &#039;openssl&#039;, self::STOP_CRITICAL);
                }
            }
            $host = $hostinfo[2];
            $port = $this-&gt;Port;
            if (
                array_key_exists(3, $hostinfo) &amp;&amp;
                is_numeric($hostinfo[3]) &amp;&amp;
                $hostinfo[3] &gt; 0 &amp;&amp;
                $hostinfo[3] &lt; 65536
            ) {
                $port = (int) $hostinfo[3];
            }
            if ($this-&gt;smtp-&gt;connect($prefix . $host, $port, $this-&gt;Timeout, $options)) {
                try {
                    if ($this-&gt;Helo) {
                        $hello = $this-&gt;Helo;
                    } else {
                        $hello = $this-&gt;serverHostname();
                    }
                    $this-&gt;smtp-&gt;hello($hello);
                    //Automatically enable TLS encryption if:
                    //* it&#039;s not disabled
                    //* we are not connecting to localhost
                    //* we have openssl extension
                    //* we are not already using SSL
                    //* the server offers STARTTLS
                    if (
                        $this-&gt;SMTPAutoTLS &amp;&amp;
                        $this-&gt;Host !== &#039;localhost&#039; &amp;&amp;
                        $sslext &amp;&amp;
                        $secure !== &#039;ssl&#039; &amp;&amp;
                        $this-&gt;smtp-&gt;getServerExt(&#039;STARTTLS&#039;)
                    ) {
                        $tls = true;
                    }
                    if ($tls) {
                        if (!$this-&gt;smtp-&gt;startTLS()) {
                            $message = $this-&gt;getSmtpErrorMessage(&#039;connect_host&#039;);
                            throw new Exception($message);
                        }
                        //We must resend EHLO after TLS negotiation
                        $this-&gt;smtp-&gt;hello($hello);
                    }
                    if (
                        $this-&gt;SMTPAuth &amp;&amp; !$this-&gt;smtp-&gt;authenticate(
                            $this-&gt;Username,
                            $this-&gt;Password,
                            $this-&gt;AuthType,
                            $this-&gt;oauth
                        )
                    ) {
                        throw new Exception($this-&gt;lang(&#039;authenticate&#039;));
                    }

                    return true;
                } catch (Exception $exc) {
                    $lastexception = $exc;
                    $this-&gt;edebug($exc-&gt;getMessage());
                    //We must have connected, but then failed TLS or Auth, so close connection nicely
                    $this-&gt;smtp-&gt;quit();
                }
            }
        }
        //If we get here, all connection attempts have failed, so close connection hard
        $this-&gt;smtp-&gt;close();
        //As we&#039;ve caught all exceptions, just report whatever the last one was
        if ($this-&gt;exceptions &amp;&amp; null !== $lastexception) {
            throw $lastexception;
        }
        if ($this-&gt;exceptions) {
            // no exception was thrown, likely $this-&gt;smtp-&gt;connect() failed
            $message = $this-&gt;getSmtpErrorMessage(&#039;connect_host&#039;);
            throw new Exception($message);
        }

        return false;
    }

    /**
     * Close the active SMTP session if one exists.
     */
    public function smtpClose()
    {
        if ((null !== $this-&gt;smtp) &amp;&amp; $this-&gt;smtp-&gt;connected()) {
            $this-&gt;smtp-&gt;quit();
            $this-&gt;smtp-&gt;close();
        }
    }

    /**
     * Set the language for error messages.
     * The default language is English.
     *
     * @param string $langcode  ISO 639-1 2-character language code (e.g. French is &quot;fr&quot;)
     *                          Optionally, the language code can be enhanced with a 4-character
     *                          script annotation and/or a 2-character country annotation.
     * @param string $lang_path Path to the language file directory, with trailing separator (slash)
     *                          Do not set this from user input!
     *
     * @return bool Returns true if the requested language was loaded, false otherwise.
     */
    public function setLanguage($langcode = &#039;en&#039;, $lang_path = &#039;&#039;)
    {
        //Backwards compatibility for renamed language codes
        $renamed_langcodes = [
            &#039;br&#039; =&gt; &#039;pt_br&#039;,
            &#039;cz&#039; =&gt; &#039;cs&#039;,
            &#039;dk&#039; =&gt; &#039;da&#039;,
            &#039;no&#039; =&gt; &#039;nb&#039;,
            &#039;se&#039; =&gt; &#039;sv&#039;,
            &#039;rs&#039; =&gt; &#039;sr&#039;,
            &#039;tg&#039; =&gt; &#039;tl&#039;,
            &#039;am&#039; =&gt; &#039;hy&#039;,
        ];

        if (array_key_exists($langcode, $renamed_langcodes)) {
            $langcode = $renamed_langcodes[$langcode];
        }

        //Define full set of translatable strings in English
        $PHPMAILER_LANG = [
            &#039;authenticate&#039; =&gt; &#039;SMTP Error: Could not authenticate.&#039;,
            &#039;buggy_php&#039; =&gt; &#039;Your version of PHP is affected by a bug that may result in corrupted messages.&#039; .
                &#039; To fix it, switch to sending using SMTP, disable the mail.add_x_header option in&#039; .
                &#039; your php.ini, switch to MacOS or Linux, or upgrade your PHP to version 7.0.17+ or 7.1.3+.&#039;,
            &#039;connect_host&#039; =&gt; &#039;SMTP Error: Could not connect to SMTP host.&#039;,
            &#039;data_not_accepted&#039; =&gt; &#039;SMTP Error: data not accepted.&#039;,
            &#039;empty_message&#039; =&gt; &#039;Message body empty&#039;,
            &#039;encoding&#039; =&gt; &#039;Unknown encoding: &#039;,
            &#039;execute&#039; =&gt; &#039;Could not execute: &#039;,
            &#039;extension_missing&#039; =&gt; &#039;Extension missing: &#039;,
            &#039;file_access&#039; =&gt; &#039;Could not access file: &#039;,
            &#039;file_open&#039; =&gt; &#039;File Error: Could not open file: &#039;,
            &#039;from_failed&#039; =&gt; &#039;The following From address failed: &#039;,
            &#039;instantiate&#039; =&gt; &#039;Could not instantiate mail function.&#039;,
            &#039;invalid_address&#039; =&gt; &#039;Invalid address: &#039;,
            &#039;invalid_header&#039; =&gt; &#039;Invalid header name or value&#039;,
            &#039;invalid_hostentry&#039; =&gt; &#039;Invalid hostentry: &#039;,
            &#039;invalid_host&#039; =&gt; &#039;Invalid host: &#039;,
            &#039;mailer_not_supported&#039; =&gt; &#039; mailer is not supported.&#039;,
            &#039;provide_address&#039; =&gt; &#039;You must provide at least one recipient email address.&#039;,
            &#039;recipients_failed&#039; =&gt; &#039;SMTP Error: The following recipients failed: &#039;,
            &#039;signing&#039; =&gt; &#039;Signing Error: &#039;,
            &#039;smtp_code&#039; =&gt; &#039;SMTP code: &#039;,
            &#039;smtp_code_ex&#039; =&gt; &#039;Additional SMTP info: &#039;,
            &#039;smtp_connect_failed&#039; =&gt; &#039;SMTP connect() failed.&#039;,
            &#039;smtp_detail&#039; =&gt; &#039;Detail: &#039;,
            &#039;smtp_error&#039; =&gt; &#039;SMTP server error: &#039;,
            &#039;variable_set&#039; =&gt; &#039;Cannot set or reset variable: &#039;,
        ];
        if (empty($lang_path)) {
            //Calculate an absolute path so it can work if CWD is not here
            $lang_path = dirname(__DIR__) . DIRECTORY_SEPARATOR . &#039;language&#039; . DIRECTORY_SEPARATOR;
        }

        //Validate $langcode
        $foundlang = true;
        $langcode  = strtolower($langcode);
        if (
            !preg_match(&#039;/^(?P&lt;lang&gt;[a-z]{2})(?P&lt;script&gt;_[a-z]{4})?(?P&lt;country&gt;_[a-z]{2})?$/&#039;, $langcode, $matches)
            &amp;&amp; $langcode !== &#039;en&#039;
        ) {
            $foundlang = false;
            $langcode = &#039;en&#039;;
        }

        //There is no English translation file
        if (&#039;en&#039; !== $langcode) {
            $langcodes = [];
            if (!empty($matches[&#039;script&#039;]) &amp;&amp; !empty($matches[&#039;country&#039;])) {
                $langcodes[] = $matches[&#039;lang&#039;] . $matches[&#039;script&#039;] . $matches[&#039;country&#039;];
            }
            if (!empty($matches[&#039;country&#039;])) {
                $langcodes[] = $matches[&#039;lang&#039;] . $matches[&#039;country&#039;];
            }
            if (!empty($matches[&#039;script&#039;])) {
                $langcodes[] = $matches[&#039;lang&#039;] . $matches[&#039;script&#039;];
            }
            $langcodes[] = $matches[&#039;lang&#039;];

            //Try and find a readable language file for the requested language.
            $foundFile = false;
            foreach ($langcodes as $code) {
                $lang_file = $lang_path . &#039;phpmailer.lang-&#039; . $code . &#039;.php&#039;;
                if (static::fileIsAccessible($lang_file)) {
                    $foundFile = true;
                    break;
                }
            }

            if ($foundFile === false) {
                $foundlang = false;
            } else {
                $lines = file($lang_file);
                foreach ($lines as $line) {
                    //Translation file lines look like this:
                    //$PHPMAILER_LANG[&#039;authenticate&#039;] = &#039;SMTP-Fehler: Authentifizierung fehlgeschlagen.&#039;;
                    //These files are parsed as text and not PHP so as to avoid the possibility of code injection
                    //See https://blog.stevenlevithan.com/archives/match-quoted-string
                    $matches = [];
                    if (
                        preg_match(
                            &#039;/^\$PHPMAILER_LANG\[\&#039;([a-z\d_]+)\&#039;\]\s*=\s*([&quot;\&#039;])(.+)*?\2;/&#039;,
                            $line,
                            $matches
                        ) &amp;&amp;
                        //Ignore unknown translation keys
                        array_key_exists($matches[1], $PHPMAILER_LANG)
                    ) {
                        //Overwrite language-specific strings so we&#039;ll never have missing translation keys.
                        $PHPMAILER_LANG[$matches[1]] = (string)$matches[3];
                    }
                }
            }
        }
        $this-&gt;language = $PHPMAILER_LANG;

        return $foundlang; //Returns false if language not found
    }

    /**
     * Get the array of strings for the current language.
     *
     * @return array
     */
    public function getTranslations()
    {
        if (empty($this-&gt;language)) {
            $this-&gt;setLanguage(); // Set the default language.
        }

        return $this-&gt;language;
    }

    /**
     * Create recipient headers.
     *
     * @param string $type
     * @param array  $addr An array of recipients,
     *                     where each recipient is a 2-element indexed array with element 0 containing an address
     *                     and element 1 containing a name, like:
     *                     [[&#039;joe@example.com&#039;, &#039;Joe User&#039;], [&#039;zoe@example.com&#039;, &#039;Zoe User&#039;]]
     *
     * @return string
     */
    public function addrAppend($type, $addr)
    {
        $addresses = [];
        foreach ($addr as $address) {
            $addresses[] = $this-&gt;addrFormat($address);
        }

        return $type . &#039;: &#039; . implode(&#039;, &#039;, $addresses) . static::$LE;
    }

    /**
     * Format an address for use in a message header.
     *
     * @param array $addr A 2-element indexed array, element 0 containing an address, element 1 containing a name like
     *                    [&#039;joe@example.com&#039;, &#039;Joe User&#039;]
     *
     * @return string
     */
    public function addrFormat($addr)
    {
        if (!isset($addr[1]) || ($addr[1] === &#039;&#039;)) { //No name provided
            return $this-&gt;secureHeader($addr[0]);
        }

        return $this-&gt;encodeHeader($this-&gt;secureHeader($addr[1]), &#039;phrase&#039;) .
            &#039; &lt;&#039; . $this-&gt;secureHeader($addr[0]) . &#039;&gt;&#039;;
    }

    /**
     * Word-wrap message.
     * For use with mailers that do not automatically perform wrapping
     * and for quoted-printable encoded messages.
     * Original written by philippe.
     *
     * @param string $message The message to wrap
     * @param int    $length  The line length to wrap to
     * @param bool   $qp_mode Whether to run in Quoted-Printable mode
     *
     * @return string
     */
    public function wrapText($message, $length, $qp_mode = false)
    {
        if ($qp_mode) {
            $soft_break = sprintf(&#039; =%s&#039;, static::$LE);
        } else {
            $soft_break = static::$LE;
        }
        //If utf-8 encoding is used, we will need to make sure we don&#039;t
        //split multibyte characters when we wrap
        $is_utf8 = static::CHARSET_UTF8 === strtolower($this-&gt;CharSet);
        $lelen = strlen(static::$LE);
        $crlflen = strlen(static::$LE);

        $message = static::normalizeBreaks($message);
        //Remove a trailing line break
        if (substr($message, -$lelen) === static::$LE) {
            $message = substr($message, 0, -$lelen);
        }

        //Split message into lines
        $lines = explode(static::$LE, $message);
        //Message will be rebuilt in here
        $message = &#039;&#039;;
        foreach ($lines as $line) {
            $words = explode(&#039; &#039;, $line);
            $buf = &#039;&#039;;
            $firstword = true;
            foreach ($words as $word) {
                if ($qp_mode &amp;&amp; (strlen($word) &gt; $length)) {
                    $space_left = $length - strlen($buf) - $crlflen;
                    if (!$firstword) {
                        if ($space_left &gt; 20) {
                            $len = $space_left;
                            if ($is_utf8) {
                                $len = $this-&gt;utf8CharBoundary($word, $len);
                            } elseif (&#039;=&#039; === substr($word, $len - 1, 1)) {
                                --$len;
                            } elseif (&#039;=&#039; === substr($word, $len - 2, 1)) {
                                $len -= 2;
                            }
                            $part = substr($word, 0, $len);
                            $word = substr($word, $len);
                            $buf .= &#039; &#039; . $part;
                            $message .= $buf . sprintf(&#039;=%s&#039;, static::$LE);
                        } else {
                            $message .= $buf . $soft_break;
                        }
                        $buf = &#039;&#039;;
                    }
                    while ($word !== &#039;&#039;) {
                        if ($length &lt;= 0) {
                            break;
                        }
                        $len = $length;
                        if ($is_utf8) {
                            $len = $this-&gt;utf8CharBoundary($word, $len);
                        } elseif (&#039;=&#039; === substr($word, $len - 1, 1)) {
                            --$len;
                        } elseif (&#039;=&#039; === substr($word, $len - 2, 1)) {
                            $len -= 2;
                        }
                        $part = substr($word, 0, $len);
                        $word = (string) substr($word, $len);

                        if ($word !== &#039;&#039;) {
                            $message .= $part . sprintf(&#039;=%s&#039;, static::$LE);
                        } else {
                            $buf = $part;
                        }
                    }
                } else {
                    $buf_o = $buf;
                    if (!$firstword) {
                        $buf .= &#039; &#039;;
                    }
                    $buf .= $word;

                    if (&#039;&#039; !== $buf_o &amp;&amp; strlen($buf) &gt; $length) {
                        $message .= $buf_o . $soft_break;
                        $buf = $word;
                    }
                }
                $firstword = false;
            }
            $message .= $buf . static::$LE;
        }

        return $message;
    }

    /**
     * Find the last character boundary prior to $maxLength in a utf-8
     * quoted-printable encoded string.
     * Original written by Colin Brown.
     *
     * @param string $encodedText utf-8 QP text
     * @param int    $maxLength   Find the last character boundary prior to this length
     *
     * @return int
     */
    public function utf8CharBoundary($encodedText, $maxLength)
    {
        $foundSplitPos = false;
        $lookBack = 3;
        while (!$foundSplitPos) {
            $lastChunk = substr($encodedText, $maxLength - $lookBack, $lookBack);
            $encodedCharPos = strpos($lastChunk, &#039;=&#039;);
            if (false !== $encodedCharPos) {
                //Found start of encoded character byte within $lookBack block.
                //Check the encoded byte value (the 2 chars after the &#039;=&#039;)
                $hex = substr($encodedText, $maxLength - $lookBack + $encodedCharPos + 1, 2);
                $dec = hexdec($hex);
                if ($dec &lt; 128) {
                    //Single byte character.
                    //If the encoded char was found at pos 0, it will fit
                    //otherwise reduce maxLength to start of the encoded char
                    if ($encodedCharPos &gt; 0) {
                        $maxLength -= $lookBack - $encodedCharPos;
                    }
                    $foundSplitPos = true;
                } elseif ($dec &gt;= 192) {
                    //First byte of a multi byte character
                    //Reduce maxLength to split at start of character
                    $maxLength -= $lookBack - $encodedCharPos;
                    $foundSplitPos = true;
                } elseif ($dec &lt; 192) {
                    //Middle byte of a multi byte character, look further back
                    $lookBack += 3;
                }
            } else {
                //No encoded character found
                $foundSplitPos = true;
            }
        }

        return $maxLength;
    }

    /**
     * Apply word wrapping to the message body.
     * Wraps the message body to the number of chars set in the WordWrap property.
     * You should only do this to plain-text bodies as wrapping HTML tags may break them.
     * This is called automatically by createBody(), so you don&#039;t need to call it yourself.
     */
    public function setWordWrap()
    {
        if ($this-&gt;WordWrap &lt; 1) {
            return;
        }

        switch ($this-&gt;message_type) {
            case &#039;alt&#039;:
            case &#039;alt_inline&#039;:
            case &#039;alt_attach&#039;:
            case &#039;alt_inline_attach&#039;:
                $this-&gt;AltBody = $this-&gt;wrapText($this-&gt;AltBody, $this-&gt;WordWrap);
                break;
            default:
                $this-&gt;Body = $this-&gt;wrapText($this-&gt;Body, $this-&gt;WordWrap);
                break;
        }
    }

    /**
     * Assemble message headers.
     *
     * @return string The assembled headers
     */
    public function createHeader()
    {
        $result = &#039;&#039;;

        $result .= $this-&gt;headerLine(&#039;Date&#039;, &#039;&#039; === $this-&gt;MessageDate ? self::rfcDate() : $this-&gt;MessageDate);

        //The To header is created automatically by mail(), so needs to be omitted here
        if (&#039;mail&#039; !== $this-&gt;Mailer) {
            if ($this-&gt;SingleTo) {
                foreach ($this-&gt;to as $toaddr) {
                    $this-&gt;SingleToArray[] = $this-&gt;addrFormat($toaddr);
                }
            } elseif (count($this-&gt;to) &gt; 0) {
                $result .= $this-&gt;addrAppend(&#039;To&#039;, $this-&gt;to);
            } elseif (count($this-&gt;cc) === 0) {
                $result .= $this-&gt;headerLine(&#039;To&#039;, &#039;undisclosed-recipients:;&#039;);
            }
        }
        $result .= $this-&gt;addrAppend(&#039;From&#039;, [[trim($this-&gt;From), $this-&gt;FromName]]);

        //sendmail and mail() extract Cc from the header before sending
        if (count($this-&gt;cc) &gt; 0) {
            $result .= $this-&gt;addrAppend(&#039;Cc&#039;, $this-&gt;cc);
        }

        //sendmail and mail() extract Bcc from the header before sending
        if (
            (
                &#039;sendmail&#039; === $this-&gt;Mailer || &#039;qmail&#039; === $this-&gt;Mailer || &#039;mail&#039; === $this-&gt;Mailer
            )
            &amp;&amp; count($this-&gt;bcc) &gt; 0
        ) {
            $result .= $this-&gt;addrAppend(&#039;Bcc&#039;, $this-&gt;bcc);
        }

        if (count($this-&gt;ReplyTo) &gt; 0) {
            $result .= $this-&gt;addrAppend(&#039;Reply-To&#039;, $this-&gt;ReplyTo);
        }

        //mail() sets the subject itself
        if (&#039;mail&#039; !== $this-&gt;Mailer) {
            $result .= $this-&gt;headerLine(&#039;Subject&#039;, $this-&gt;encodeHeader($this-&gt;secureHeader($this-&gt;Subject)));
        }

        //Only allow a custom message ID if it conforms to RFC 5322 section 3.6.4
        //https://www.rfc-editor.org/rfc/rfc5322#section-3.6.4
        if (
            &#039;&#039; !== $this-&gt;MessageID &amp;&amp;
            preg_match(
                &#039;/^&lt;((([a-z\d!#$%&amp;\&#039;*+\/=?^_`{|}~-]+(\.[a-z\d!#$%&amp;\&#039;*+\/=?^_`{|}~-]+)*)&#039; .
                &#039;|(&quot;(([\x01-\x08\x0B\x0C\x0E-\x1F\x7F]|[\x21\x23-\x5B\x5D-\x7E])&#039; .
                &#039;|(\\[\x01-\x09\x0B\x0C\x0E-\x7F]))*&quot;))@(([a-z\d!#$%&amp;\&#039;*+\/=?^_`{|}~-]+&#039; .
                &#039;(\.[a-z\d!#$%&amp;\&#039;*+\/=?^_`{|}~-]+)*)|(\[(([\x01-\x08\x0B\x0C\x0E-\x1F\x7F]&#039; .
                &#039;|[\x21-\x5A\x5E-\x7E])|(\\[\x01-\x09\x0B\x0C\x0E-\x7F]))*\])))&gt;$/Di&#039;,
                $this-&gt;MessageID
            )
        ) {
            $this-&gt;lastMessageID = $this-&gt;MessageID;
        } else {
            $this-&gt;lastMessageID = sprintf(&#039;&lt;%s@%s&gt;&#039;, $this-&gt;uniqueid, $this-&gt;serverHostname());
        }
        $result .= $this-&gt;headerLine(&#039;Message-ID&#039;, $this-&gt;lastMessageID);
        if (null !== $this-&gt;Priority) {
            $result .= $this-&gt;headerLine(&#039;X-Priority&#039;, $this-&gt;Priority);
        }
        if (&#039;&#039; === $this-&gt;XMailer) {
            //Empty string for default X-Mailer header
            $result .= $this-&gt;headerLine(
                &#039;X-Mailer&#039;,
                &#039;PHPMailer &#039; . self::VERSION . &#039; (https://github.com/PHPMailer/PHPMailer)&#039;
            );
        } elseif (is_string($this-&gt;XMailer) &amp;&amp; trim($this-&gt;XMailer) !== &#039;&#039;) {
            //Some string
            $result .= $this-&gt;headerLine(&#039;X-Mailer&#039;, trim($this-&gt;XMailer));
        } //Other values result in no X-Mailer header

        if (&#039;&#039; !== $this-&gt;ConfirmReadingTo) {
            $result .= $this-&gt;headerLine(&#039;Disposition-Notification-To&#039;, &#039;&lt;&#039; . $this-&gt;ConfirmReadingTo . &#039;&gt;&#039;);
        }

        //Add custom headers
        foreach ($this-&gt;CustomHeader as $header) {
            $result .= $this-&gt;headerLine(
                trim($header[0]),
                $this-&gt;encodeHeader(trim($header[1]))
            );
        }
        if (!$this-&gt;sign_key_file) {
            $result .= $this-&gt;headerLine(&#039;MIME-Version&#039;, &#039;1.0&#039;);
            $result .= $this-&gt;getMailMIME();
        }

        return $result;
    }

    /**
     * Get the message MIME type headers.
     *
     * @return string
     */
    public function getMailMIME()
    {
        $result = &#039;&#039;;
        $ismultipart = true;
        switch ($this-&gt;message_type) {
            case &#039;inline&#039;:
                $result .= $this-&gt;headerLine(&#039;Content-Type&#039;, static::CONTENT_TYPE_MULTIPART_RELATED . &#039;;&#039;);
                $result .= $this-&gt;textLine(&#039; boundary=&quot;&#039; . $this-&gt;boundary[1] . &#039;&quot;&#039;);
                break;
            case &#039;attach&#039;:
            case &#039;inline_attach&#039;:
            case &#039;alt_attach&#039;:
            case &#039;alt_inline_attach&#039;:
                $result .= $this-&gt;headerLine(&#039;Content-Type&#039;, static::CONTENT_TYPE_MULTIPART_MIXED . &#039;;&#039;);
                $result .= $this-&gt;textLine(&#039; boundary=&quot;&#039; . $this-&gt;boundary[1] . &#039;&quot;&#039;);
                break;
            case &#039;alt&#039;:
            case &#039;alt_inline&#039;:
                $result .= $this-&gt;headerLine(&#039;Content-Type&#039;, static::CONTENT_TYPE_MULTIPART_ALTERNATIVE . &#039;;&#039;);
                $result .= $this-&gt;textLine(&#039; boundary=&quot;&#039; . $this-&gt;boundary[1] . &#039;&quot;&#039;);
                break;
            default:
                //Catches case &#039;plain&#039;: and case &#039;&#039;:
                $result .= $this-&gt;textLine(&#039;Content-Type: &#039; . $this-&gt;ContentType . &#039;; charset=&#039; . $this-&gt;CharSet);
                $ismultipart = false;
                break;
        }
        //RFC1341 part 5 says 7bit is assumed if not specified
        if (static::ENCODING_7BIT !== $this-&gt;Encoding) {
            //RFC 2045 section 6.4 says multipart MIME parts may only use 7bit, 8bit or binary CTE
            if ($ismultipart) {
                if (static::ENCODING_8BIT === $this-&gt;Encoding) {
                    $result .= $this-&gt;headerLine(&#039;Content-Transfer-Encoding&#039;, static::ENCODING_8BIT);
                }
                //The only remaining alternatives are quoted-printable and base64, which are both 7bit compatible
            } else {
                $result .= $this-&gt;headerLine(&#039;Content-Transfer-Encoding&#039;, $this-&gt;Encoding);
            }
        }

        return $result;
    }

    /**
     * Returns the whole MIME message.
     * Includes complete headers and body.
     * Only valid post preSend().
     *
     * @see PHPMailer::preSend()
     *
     * @return string
     */
    public function getSentMIMEMessage()
    {
        return static::stripTrailingWSP($this-&gt;MIMEHeader . $this-&gt;mailHeader) .
            static::$LE . static::$LE . $this-&gt;MIMEBody;
    }

    /**
     * Create a unique ID to use for boundaries.
     *
     * @return string
     */
    protected function generateId()
    {
        $len = 32; //32 bytes = 256 bits
        $bytes = &#039;&#039;;
        if (function_exists(&#039;random_bytes&#039;)) {
            try {
                $bytes = random_bytes($len);
            } catch (\Exception $e) {
                //Do nothing
            }
        } elseif (function_exists(&#039;openssl_random_pseudo_bytes&#039;)) {
            /** @noinspection CryptographicallySecureRandomnessInspection */
            $bytes = openssl_random_pseudo_bytes($len);
        }
        if ($bytes === &#039;&#039;) {
            //We failed to produce a proper random string, so make do.
            //Use a hash to force the length to the same as the other methods
            $bytes = hash(&#039;sha256&#039;, uniqid((string) mt_rand(), true), true);
        }

        //We don&#039;t care about messing up base64 format here, just want a random string
        return str_replace([&#039;=&#039;, &#039;+&#039;, &#039;/&#039;], &#039;&#039;, base64_encode(hash(&#039;sha256&#039;, $bytes, true)));
    }

    /**
     * Assemble the message body.
     * Returns an empty string on failure.
     *
     * @throws Exception
     *
     * @return string The assembled message body
     */
    public function createBody()
    {
        $body = &#039;&#039;;
        //Create unique IDs and preset boundaries
        $this-&gt;setBoundaries();

        if ($this-&gt;sign_key_file) {
            $body .= $this-&gt;getMailMIME() . static::$LE;
        }

        $this-&gt;setWordWrap();

        $bodyEncoding = $this-&gt;Encoding;
        $bodyCharSet = $this-&gt;CharSet;
        //Can we do a 7-bit downgrade?
        if (static::ENCODING_8BIT === $bodyEncoding &amp;&amp; !$this-&gt;has8bitChars($this-&gt;Body)) {
            $bodyEncoding = static::ENCODING_7BIT;
            //All ISO 8859, Windows codepage and UTF-8 charsets are ascii compatible up to 7-bit
            $bodyCharSet = static::CHARSET_ASCII;
        }
        //If lines are too long, and we&#039;re not already using an encoding that will shorten them,
        //change to quoted-printable transfer encoding for the body part only
        if (static::ENCODING_BASE64 !== $this-&gt;Encoding &amp;&amp; static::hasLineLongerThanMax($this-&gt;Body)) {
            $bodyEncoding = static::ENCODING_QUOTED_PRINTABLE;
        }

        $altBodyEncoding = $this-&gt;Encoding;
        $altBodyCharSet = $this-&gt;CharSet;
        //Can we do a 7-bit downgrade?
        if (static::ENCODING_8BIT === $altBodyEncoding &amp;&amp; !$this-&gt;has8bitChars($this-&gt;AltBody)) {
            $altBodyEncoding = static::ENCODING_7BIT;
            //All ISO 8859, Windows codepage and UTF-8 charsets are ascii compatible up to 7-bit
            $altBodyCharSet = static::CHARSET_ASCII;
        }
        //If lines are too long, and we&#039;re not already using an encoding that will shorten them,
        //change to quoted-printable transfer encoding for the alt body part only
        if (static::ENCODING_BASE64 !== $altBodyEncoding &amp;&amp; static::hasLineLongerThanMax($this-&gt;AltBody)) {
            $altBodyEncoding = static::ENCODING_QUOTED_PRINTABLE;
        }
        //Use this as a preamble in all multipart message types
        $mimepre = &#039;&#039;;
        switch ($this-&gt;message_type) {
            case &#039;inline&#039;:
                $body .= $mimepre;
                $body .= $this-&gt;getBoundary($this-&gt;boundary[1], $bodyCharSet, &#039;&#039;, $bodyEncoding);
                $body .= $this-&gt;encodeString($this-&gt;Body, $bodyEncoding);
                $body .= static::$LE;
                $body .= $this-&gt;attachAll(&#039;inline&#039;, $this-&gt;boundary[1]);
                break;
            case &#039;attach&#039;:
                $body .= $mimepre;
                $body .= $this-&gt;getBoundary($this-&gt;boundary[1], $bodyCharSet, &#039;&#039;, $bodyEncoding);
                $body .= $this-&gt;encodeString($this-&gt;Body, $bodyEncoding);
                $body .= static::$LE;
                $body .= $this-&gt;attachAll(&#039;attachment&#039;, $this-&gt;boundary[1]);
                break;
            case &#039;inline_attach&#039;:
                $body .= $mimepre;
                $body .= $this-&gt;textLine(&#039;--&#039; . $this-&gt;boundary[1]);
                $body .= $this-&gt;headerLine(&#039;Content-Type&#039;, static::CONTENT_TYPE_MULTIPART_RELATED . &#039;;&#039;);
                $body .= $this-&gt;textLine(&#039; boundary=&quot;&#039; . $this-&gt;boundary[2] . &#039;&quot;;&#039;);
                $body .= $this-&gt;textLine(&#039; type=&quot;&#039; . static::CONTENT_TYPE_TEXT_HTML . &#039;&quot;&#039;);
                $body .= static::$LE;
                $body .= $this-&gt;getBoundary($this-&gt;boundary[2], $bodyCharSet, &#039;&#039;, $bodyEncoding);
                $body .= $this-&gt;encodeString($this-&gt;Body, $bodyEncoding);
                $body .= static::$LE;
                $body .= $this-&gt;attachAll(&#039;inline&#039;, $this-&gt;boundary[2]);
                $body .= static::$LE;
                $body .= $this-&gt;attachAll(&#039;attachment&#039;, $this-&gt;boundary[1]);
                break;
            case &#039;alt&#039;:
                $body .= $mimepre;
                $body .= $this-&gt;getBoundary(
                    $this-&gt;boundary[1],
                    $altBodyCharSet,
                    static::CONTENT_TYPE_PLAINTEXT,
                    $altBodyEncoding
                );
                $body .= $this-&gt;encodeString($this-&gt;AltBody, $altBodyEncoding);
                $body .= static::$LE;
                $body .= $this-&gt;getBoundary(
                    $this-&gt;boundary[1],
                    $bodyCharSet,
                    static::CONTENT_TYPE_TEXT_HTML,
                    $bodyEncoding
                );
                $body .= $this-&gt;encodeString($this-&gt;Body, $bodyEncoding);
                $body .= static::$LE;
                if (!empty($this-&gt;Ical)) {
                    $method = static::ICAL_METHOD_REQUEST;
                    foreach (static::$IcalMethods as $imethod) {
                        if (stripos($this-&gt;Ical, &#039;METHOD:&#039; . $imethod) !== false) {
                            $method = $imethod;
                            break;
                        }
                    }
                    $body .= $this-&gt;getBoundary(
                        $this-&gt;boundary[1],
                        &#039;&#039;,
                        static::CONTENT_TYPE_TEXT_CALENDAR . &#039;; method=&#039; . $method,
                        &#039;&#039;
                    );
                    $body .= $this-&gt;encodeString($this-&gt;Ical, $this-&gt;Encoding);
                    $body .= static::$LE;
                }
                $body .= $this-&gt;endBoundary($this-&gt;boundary[1]);
                break;
            case &#039;alt_inline&#039;:
                $body .= $mimepre;
                $body .= $this-&gt;getBoundary(
                    $this-&gt;boundary[1],
                    $altBodyCharSet,
                    static::CONTENT_TYPE_PLAINTEXT,
                    $altBodyEncoding
                );
                $body .= $this-&gt;encodeString($this-&gt;AltBody, $altBodyEncoding);
                $body .= static::$LE;
                $body .= $this-&gt;textLine(&#039;--&#039; . $this-&gt;boundary[1]);
                $body .= $this-&gt;headerLine(&#039;Content-Type&#039;, static::CONTENT_TYPE_MULTIPART_RELATED . &#039;;&#039;);
                $body .= $this-&gt;textLine(&#039; boundary=&quot;&#039; . $this-&gt;boundary[2] . &#039;&quot;;&#039;);
                $body .= $this-&gt;textLine(&#039; type=&quot;&#039; . static::CONTENT_TYPE_TEXT_HTML . &#039;&quot;&#039;);
                $body .= static::$LE;
                $body .= $this-&gt;getBoundary(
                    $this-&gt;boundary[2],
                    $bodyCharSet,
                    static::CONTENT_TYPE_TEXT_HTML,
                    $bodyEncoding
                );
                $body .= $this-&gt;encodeString($this-&gt;Body, $bodyEncoding);
                $body .= static::$LE;
                $body .= $this-&gt;attachAll(&#039;inline&#039;, $this-&gt;boundary[2]);
                $body .= static::$LE;
                $body .= $this-&gt;endBoundary($this-&gt;boundary[1]);
                break;
            case &#039;alt_attach&#039;:
                $body .= $mimepre;
                $body .= $this-&gt;textLine(&#039;--&#039; . $this-&gt;boundary[1]);
                $body .= $this-&gt;headerLine(&#039;Content-Type&#039;, static::CONTENT_TYPE_MULTIPART_ALTERNATIVE . &#039;;&#039;);
                $body .= $this-&gt;textLine(&#039; boundary=&quot;&#039; . $this-&gt;boundary[2] . &#039;&quot;&#039;);
                $body .= static::$LE;
                $body .= $this-&gt;getBoundary(
                    $this-&gt;boundary[2],
                    $altBodyCharSet,
                    static::CONTENT_TYPE_PLAINTEXT,
                    $altBodyEncoding
                );
                $body .= $this-&gt;encodeString($this-&gt;AltBody, $altBodyEncoding);
                $body .= static::$LE;
                $body .= $this-&gt;getBoundary(
                    $this-&gt;boundary[2],
                    $bodyCharSet,
                    static::CONTENT_TYPE_TEXT_HTML,
                    $bodyEncoding
                );
                $body .= $this-&gt;encodeString($this-&gt;Body, $bodyEncoding);
                $body .= static::$LE;
                if (!empty($this-&gt;Ical)) {
                    $method = static::ICAL_METHOD_REQUEST;
                    foreach (static::$IcalMethods as $imethod) {
                        if (stripos($this-&gt;Ical, &#039;METHOD:&#039; . $imethod) !== false) {
                            $method = $imethod;
                            break;
                        }
                    }
                    $body .= $this-&gt;getBoundary(
                        $this-&gt;boundary[2],
                        &#039;&#039;,
                        static::CONTENT_TYPE_TEXT_CALENDAR . &#039;; method=&#039; . $method,
                        &#039;&#039;
                    );
                    $body .= $this-&gt;encodeString($this-&gt;Ical, $this-&gt;Encoding);
                }
                $body .= $this-&gt;endBoundary($this-&gt;boundary[2]);
                $body .= static::$LE;
                $body .= $this-&gt;attachAll(&#039;attachment&#039;, $this-&gt;boundary[1]);
                break;
            case &#039;alt_inline_attach&#039;:
                $body .= $mimepre;
                $body .= $this-&gt;textLine(&#039;--&#039; . $this-&gt;boundary[1]);
                $body .= $this-&gt;headerLine(&#039;Content-Type&#039;, static::CONTENT_TYPE_MULTIPART_ALTERNATIVE . &#039;;&#039;);
                $body .= $this-&gt;textLine(&#039; boundary=&quot;&#039; . $this-&gt;boundary[2] . &#039;&quot;&#039;);
                $body .= static::$LE;
                $body .= $this-&gt;getBoundary(
                    $this-&gt;boundary[2],
                    $altBodyCharSet,
                    static::CONTENT_TYPE_PLAINTEXT,
                    $altBodyEncoding
                );
                $body .= $this-&gt;encodeString($this-&gt;AltBody, $altBodyEncoding);
                $body .= static::$LE;
                $body .= $this-&gt;textLine(&#039;--&#039; . $this-&gt;boundary[2]);
                $body .= $this-&gt;headerLine(&#039;Content-Type&#039;, static::CONTENT_TYPE_MULTIPART_RELATED . &#039;;&#039;);
                $body .= $this-&gt;textLine(&#039; boundary=&quot;&#039; . $this-&gt;boundary[3] . &#039;&quot;;&#039;);
                $body .= $this-&gt;textLine(&#039; type=&quot;&#039; . static::CONTENT_TYPE_TEXT_HTML . &#039;&quot;&#039;);
                $body .= static::$LE;
                $body .= $this-&gt;getBoundary(
                    $this-&gt;boundary[3],
                    $bodyCharSet,
                    static::CONTENT_TYPE_TEXT_HTML,
                    $bodyEncoding
                );
                $body .= $this-&gt;encodeString($this-&gt;Body, $bodyEncoding);
                $body .= static::$LE;
                $body .= $this-&gt;attachAll(&#039;inline&#039;, $this-&gt;boundary[3]);
                $body .= static::$LE;
                $body .= $this-&gt;endBoundary($this-&gt;boundary[2]);
                $body .= static::$LE;
                $body .= $this-&gt;attachAll(&#039;attachment&#039;, $this-&gt;boundary[1]);
                break;
            default:
                //Catch case &#039;plain&#039; and case &#039;&#039;, applies to simple `text/plain` and `text/html` body content types
                //Reset the `Encoding` property in case we changed it for line length reasons
                $this-&gt;Encoding = $bodyEncoding;
                $body .= $this-&gt;encodeString($this-&gt;Body, $this-&gt;Encoding);
                break;
        }

        if ($this-&gt;isError()) {
            $body = &#039;&#039;;
            if ($this-&gt;exceptions) {
                throw new Exception($this-&gt;lang(&#039;empty_message&#039;), self::STOP_CRITICAL);
            }
        } elseif ($this-&gt;sign_key_file) {
            try {
                if (!defined(&#039;PKCS7_TEXT&#039;)) {
                    throw new Exception($this-&gt;lang(&#039;extension_missing&#039;) . &#039;openssl&#039;);
                }

                $file = tempnam(sys_get_temp_dir(), &#039;srcsign&#039;);
                $signed = tempnam(sys_get_temp_dir(), &#039;mailsign&#039;);
                file_put_contents($file, $body);

                //Workaround for PHP bug https://bugs.php.net/bug.php?id=69197
                if (empty($this-&gt;sign_extracerts_file)) {
                    $sign = @openssl_pkcs7_sign(
                        $file,
                        $signed,
                        &#039;file://&#039; . realpath($this-&gt;sign_cert_file),
                        [&#039;file://&#039; . realpath($this-&gt;sign_key_file), $this-&gt;sign_key_pass],
                        []
                    );
                } else {
                    $sign = @openssl_pkcs7_sign(
                        $file,
                        $signed,
                        &#039;file://&#039; . realpath($this-&gt;sign_cert_file),
                        [&#039;file://&#039; . realpath($this-&gt;sign_key_file), $this-&gt;sign_key_pass],
                        [],
                        PKCS7_DETACHED,
                        $this-&gt;sign_extracerts_file
                    );
                }

                @unlink($file);
                if ($sign) {
                    $body = file_get_contents($signed);
                    @unlink($signed);
                    //The message returned by openssl contains both headers and body, so need to split them up
                    $parts = explode(&quot;\n\n&quot;, $body, 2);
                    $this-&gt;MIMEHeader .= $parts[0] . static::$LE . static::$LE;
                    $body = $parts[1];
                } else {
                    @unlink($signed);
                    throw new Exception($this-&gt;lang(&#039;signing&#039;) . openssl_error_string());
                }
            } catch (Exception $exc) {
                $body = &#039;&#039;;
                if ($this-&gt;exceptions) {
                    throw $exc;
                }
            }
        }

        return $body;
    }

    /**
     * Get the boundaries that this message will use
     * @return array
     */
    public function getBoundaries()
    {
        if (empty($this-&gt;boundary)) {
            $this-&gt;setBoundaries();
        }
        return $this-&gt;boundary;
    }

    /**
     * Return the start of a message boundary.
     *
     * @param string $boundary
     * @param string $charSet
     * @param string $contentType
     * @param string $encoding
     *
     * @return string
     */
    protected function getBoundary($boundary, $charSet, $contentType, $encoding)
    {
        $result = &#039;&#039;;
        if (&#039;&#039; === $charSet) {
            $charSet = $this-&gt;CharSet;
        }
        if (&#039;&#039; === $contentType) {
            $contentType = $this-&gt;ContentType;
        }
        if (&#039;&#039; === $encoding) {
            $encoding = $this-&gt;Encoding;
        }
        $result .= $this-&gt;textLine(&#039;--&#039; . $boundary);
        $result .= sprintf(&#039;Content-Type: %s; charset=%s&#039;, $contentType, $charSet);
        $result .= static::$LE;
        //RFC1341 part 5 says 7bit is assumed if not specified
        if (static::ENCODING_7BIT !== $encoding) {
            $result .= $this-&gt;headerLine(&#039;Content-Transfer-Encoding&#039;, $encoding);
        }
        $result .= static::$LE;

        return $result;
    }

    /**
     * Return the end of a message boundary.
     *
     * @param string $boundary
     *
     * @return string
     */
    protected function endBoundary($boundary)
    {
        return static::$LE . &#039;--&#039; . $boundary . &#039;--&#039; . static::$LE;
    }

    /**
     * Set the message type.
     * PHPMailer only supports some preset message types, not arbitrary MIME structures.
     */
    protected function setMessageType()
    {
        $type = [];
        if ($this-&gt;alternativeExists()) {
            $type[] = &#039;alt&#039;;
        }
        if ($this-&gt;inlineImageExists()) {
            $type[] = &#039;inline&#039;;
        }
        if ($this-&gt;attachmentExists()) {
            $type[] = &#039;attach&#039;;
        }
        $this-&gt;message_type = implode(&#039;_&#039;, $type);
        if (&#039;&#039; === $this-&gt;message_type) {
            //The &#039;plain&#039; message_type refers to the message having a single body element, not that it is plain-text
            $this-&gt;message_type = &#039;plain&#039;;
        }
    }

    /**
     * Format a header line.
     *
     * @param string     $name
     * @param string|int $value
     *
     * @return string
     */
    public function headerLine($name, $value)
    {
        return $name . &#039;: &#039; . $value . static::$LE;
    }

    /**
     * Return a formatted mail line.
     *
     * @param string $value
     *
     * @return string
     */
    public function textLine($value)
    {
        return $value . static::$LE;
    }

    /**
     * Add an attachment from a path on the filesystem.
     * Never use a user-supplied path to a file!
     * Returns false if the file could not be found or read.
     * Explicitly *does not* support passing URLs; PHPMailer is not an HTTP client.
     * If you need to do that, fetch the resource yourself and pass it in via a local file or string.
     *
     * @param string $path        Path to the attachment
     * @param string $name        Overrides the attachment name
     * @param string $encoding    File encoding (see $Encoding)
     * @param string $type        MIME type, e.g. `image/jpeg`; determined automatically from $path if not specified
     * @param string $disposition Disposition to use
     *
     * @throws Exception
     *
     * @return bool
     */
    public function addAttachment(
        $path,
        $name = &#039;&#039;,
        $encoding = self::ENCODING_BASE64,
        $type = &#039;&#039;,
        $disposition = &#039;attachment&#039;
    ) {
        try {
            if (!static::fileIsAccessible($path)) {
                throw new Exception($this-&gt;lang(&#039;file_access&#039;) . $path, self::STOP_CONTINUE);
            }

            //If a MIME type is not specified, try to work it out from the file name
            if (&#039;&#039; === $type) {
                $type = static::filenameToType($path);
            }

            $filename = (string) static::mb_pathinfo($path, PATHINFO_BASENAME);
            if (&#039;&#039; === $name) {
                $name = $filename;
            }
            if (!$this-&gt;validateEncoding($encoding)) {
                throw new Exception($this-&gt;lang(&#039;encoding&#039;) . $encoding);
            }

            $this-&gt;attachment[] = [
                0 =&gt; $path,
                1 =&gt; $filename,
                2 =&gt; $name,
                3 =&gt; $encoding,
                4 =&gt; $type,
                5 =&gt; false, //isStringAttachment
                6 =&gt; $disposition,
                7 =&gt; $name,
            ];
        } catch (Exception $exc) {
            $this-&gt;setError($exc-&gt;getMessage());
            $this-&gt;edebug($exc-&gt;getMessage());
            if ($this-&gt;exceptions) {
                throw $exc;
            }

            return false;
        }

        return true;
    }

    /**
     * Return the array of attachments.
     *
     * @return array
     */
    public function getAttachments()
    {
        return $this-&gt;attachment;
    }

    /**
     * Attach all file, string, and binary attachments to the message.
     * Returns an empty string on failure.
     *
     * @param string $disposition_type
     * @param string $boundary
     *
     * @throws Exception
     *
     * @return string
     */
    protected function attachAll($disposition_type, $boundary)
    {
        //Return text of body
        $mime = [];
        $cidUniq = [];
        $incl = [];

        //Add all attachments
        foreach ($this-&gt;attachment as $attachment) {
            //Check if it is a valid disposition_filter
            if ($attachment[6] === $disposition_type) {
                //Check for string attachment
                $string = &#039;&#039;;
                $path = &#039;&#039;;
                $bString = $attachment[5];
                if ($bString) {
                    $string = $attachment[0];
                } else {
                    $path = $attachment[0];
                }

                $inclhash = hash(&#039;sha256&#039;, serialize($attachment));
                if (in_array($inclhash, $incl, true)) {
                    continue;
                }
                $incl[] = $inclhash;
                $name = $attachment[2];
                $encoding = $attachment[3];
                $type = $attachment[4];
                $disposition = $attachment[6];
                $cid = $attachment[7];
                if (&#039;inline&#039; === $disposition &amp;&amp; array_key_exists($cid, $cidUniq)) {
                    continue;
                }
                $cidUniq[$cid] = true;

                $mime[] = sprintf(&#039;--%s%s&#039;, $boundary, static::$LE);
                //Only include a filename property if we have one
                if (!empty($name)) {
                    $mime[] = sprintf(
                        &#039;Content-Type: %s; name=%s%s&#039;,
                        $type,
                        static::quotedString($this-&gt;encodeHeader($this-&gt;secureHeader($name))),
                        static::$LE
                    );
                } else {
                    $mime[] = sprintf(
                        &#039;Content-Type: %s%s&#039;,
                        $type,
                        static::$LE
                    );
                }
                //RFC1341 part 5 says 7bit is assumed if not specified
                if (static::ENCODING_7BIT !== $encoding) {
                    $mime[] = sprintf(&#039;Content-Transfer-Encoding: %s%s&#039;, $encoding, static::$LE);
                }

                //Only set Content-IDs on inline attachments
                if ((string) $cid !== &#039;&#039; &amp;&amp; $disposition === &#039;inline&#039;) {
                    $mime[] = &#039;Content-ID: &lt;&#039; . $this-&gt;encodeHeader($this-&gt;secureHeader($cid)) . &#039;&gt;&#039; . static::$LE;
                }

                //Allow for bypassing the Content-Disposition header
                if (!empty($disposition)) {
                    $encoded_name = $this-&gt;encodeHeader($this-&gt;secureHeader($name));
                    if (!empty($encoded_name)) {
                        $mime[] = sprintf(
                            &#039;Content-Disposition: %s; filename=%s%s&#039;,
                            $disposition,
                            static::quotedString($encoded_name),
                            static::$LE . static::$LE
                        );
                    } else {
                        $mime[] = sprintf(
                            &#039;Content-Disposition: %s%s&#039;,
                            $disposition,
                            static::$LE . static::$LE
                        );
                    }
                } else {
                    $mime[] = static::$LE;
                }

                //Encode as string attachment
                if ($bString) {
                    $mime[] = $this-&gt;encodeString($string, $encoding);
                } else {
                    $mime[] = $this-&gt;encodeFile($path, $encoding);
                }
                if ($this-&gt;isError()) {
                    return &#039;&#039;;
                }
                $mime[] = static::$LE;
            }
        }

        $mime[] = sprintf(&#039;--%s--%s&#039;, $boundary, static::$LE);

        return implode(&#039;&#039;, $mime);
    }

    /**
     * Encode a file attachment in requested format.
     * Returns an empty string on failure.
     *
     * @param string $path     The full path to the file
     * @param string $encoding The encoding to use; one of &#039;base64&#039;, &#039;7bit&#039;, &#039;8bit&#039;, &#039;binary&#039;, &#039;quoted-printable&#039;
     *
     * @return string
     */
    protected function encodeFile($path, $encoding = self::ENCODING_BASE64)
    {
        try {
            if (!static::fileIsAccessible($path)) {
                throw new Exception($this-&gt;lang(&#039;file_open&#039;) . $path, self::STOP_CONTINUE);
            }
            $file_buffer = file_get_contents($path);
            if (false === $file_buffer) {
                throw new Exception($this-&gt;lang(&#039;file_open&#039;) . $path, self::STOP_CONTINUE);
            }
            $file_buffer = $this-&gt;encodeString($file_buffer, $encoding);

            return $file_buffer;
        } catch (Exception $exc) {
            $this-&gt;setError($exc-&gt;getMessage());
            $this-&gt;edebug($exc-&gt;getMessage());
            if ($this-&gt;exceptions) {
                throw $exc;
            }

            return &#039;&#039;;
        }
    }

    /**
     * Encode a string in requested format.
     * Returns an empty string on failure.
     *
     * @param string $str      The text to encode
     * @param string $encoding The encoding to use; one of &#039;base64&#039;, &#039;7bit&#039;, &#039;8bit&#039;, &#039;binary&#039;, &#039;quoted-printable&#039;
     *
     * @throws Exception
     *
     * @return string
     */
    public function encodeString($str, $encoding = self::ENCODING_BASE64)
    {
        $encoded = &#039;&#039;;
        switch (strtolower($encoding)) {
            case static::ENCODING_BASE64:
                $encoded = chunk_split(
                    base64_encode($str),
                    static::STD_LINE_LENGTH,
                    static::$LE
                );
                break;
            case static::ENCODING_7BIT:
            case static::ENCODING_8BIT:
                $encoded = static::normalizeBreaks($str);
                //Make sure it ends with a line break
                if (substr($encoded, -(strlen(static::$LE))) !== static::$LE) {
                    $encoded .= static::$LE;
                }
                break;
            case static::ENCODING_BINARY:
                $encoded = $str;
                break;
            case static::ENCODING_QUOTED_PRINTABLE:
                $encoded = $this-&gt;encodeQP($str);
                break;
            default:
                $this-&gt;setError($this-&gt;lang(&#039;encoding&#039;) . $encoding);
                if ($this-&gt;exceptions) {
                    throw new Exception($this-&gt;lang(&#039;encoding&#039;) . $encoding);
                }
                break;
        }

        return $encoded;
    }

    /**
     * Encode a header value (not including its label) optimally.
     * Picks shortest of Q, B, or none. Result includes folding if needed.
     * See RFC822 definitions for phrase, comment and text positions.
     *
     * @param string $str      The header value to encode
     * @param string $position What context the string will be used in
     *
     * @return string
     */
    public function encodeHeader($str, $position = &#039;text&#039;)
    {
        $matchcount = 0;
        switch (strtolower($position)) {
            case &#039;phrase&#039;:
                if (!preg_match(&#039;/[\200-\377]/&#039;, $str)) {
                    //Can&#039;t use addslashes as we don&#039;t know the value of magic_quotes_sybase
                    $encoded = addcslashes($str, &quot;\0..\37\177\\\&quot;&quot;);
                    if (($str === $encoded) &amp;&amp; !preg_match(&#039;/[^A-Za-z0-9!#$%&amp;\&#039;*+\/=?^_`{|}~ -]/&#039;, $str)) {
                        return $encoded;
                    }

                    return &quot;\&quot;$encoded\&quot;&quot;;
                }
                $matchcount = preg_match_all(&#039;/[^\040\041\043-\133\135-\176]/&#039;, $str, $matches);
                break;
            /* @noinspection PhpMissingBreakStatementInspection */
            case &#039;comment&#039;:
                $matchcount = preg_match_all(&#039;/[()&quot;]/&#039;, $str, $matches);
            //fallthrough
            case &#039;text&#039;:
            default:
                $matchcount += preg_match_all(&#039;/[\000-\010\013\014\016-\037\177-\377]/&#039;, $str, $matches);
                break;
        }

        if ($this-&gt;has8bitChars($str)) {
            $charset = $this-&gt;CharSet;
        } else {
            $charset = static::CHARSET_ASCII;
        }

        //Q/B encoding adds 8 chars and the charset (&quot;` =?&lt;charset&gt;?[QB]?&lt;content&gt;?=`&quot;).
        $overhead = 8 + strlen($charset);

        if (&#039;mail&#039; === $this-&gt;Mailer) {
            $maxlen = static::MAIL_MAX_LINE_LENGTH - $overhead;
        } else {
            $maxlen = static::MAX_LINE_LENGTH - $overhead;
        }

        //Select the encoding that produces the shortest output and/or prevents corruption.
        if ($matchcount &gt; strlen($str) / 3) {
            //More than 1/3 of the content needs encoding, use B-encode.
            $encoding = &#039;B&#039;;
        } elseif ($matchcount &gt; 0) {
            //Less than 1/3 of the content needs encoding, use Q-encode.
            $encoding = &#039;Q&#039;;
        } elseif (strlen($str) &gt; $maxlen) {
            //No encoding needed, but value exceeds max line length, use Q-encode to prevent corruption.
            $encoding = &#039;Q&#039;;
        } else {
            //No reformatting needed
            $encoding = false;
        }

        switch ($encoding) {
            case &#039;B&#039;:
                if ($this-&gt;hasMultiBytes($str)) {
                    //Use a custom function which correctly encodes and wraps long
                    //multibyte strings without breaking lines within a character
                    $encoded = $this-&gt;base64EncodeWrapMB($str, &quot;\n&quot;);
                } else {
                    $encoded = base64_encode($str);
                    $maxlen -= $maxlen % 4;
                    $encoded = trim(chunk_split($encoded, $maxlen, &quot;\n&quot;));
                }
                $encoded = preg_replace(&#039;/^(.*)$/m&#039;, &#039; =?&#039; . $charset . &quot;?$encoding?\\1?=&quot;, $encoded);
                break;
            case &#039;Q&#039;:
                $encoded = $this-&gt;encodeQ($str, $position);
                $encoded = $this-&gt;wrapText($encoded, $maxlen, true);
                $encoded = str_replace(&#039;=&#039; . static::$LE, &quot;\n&quot;, trim($encoded));
                $encoded = preg_replace(&#039;/^(.*)$/m&#039;, &#039; =?&#039; . $charset . &quot;?$encoding?\\1?=&quot;, $encoded);
                break;
            default:
                return $str;
        }

        return trim(static::normalizeBreaks($encoded));
    }

    /**
     * Check if a string contains multi-byte characters.
     *
     * @param string $str multi-byte text to wrap encode
     *
     * @return bool
     */
    public function hasMultiBytes($str)
    {
        if (function_exists(&#039;mb_strlen&#039;)) {
            return strlen($str) &gt; mb_strlen($str, $this-&gt;CharSet);
        }

        //Assume no multibytes (we can&#039;t handle without mbstring functions anyway)
        return false;
    }

    /**
     * Does a string contain any 8-bit chars (in any charset)?
     *
     * @param string $text
     *
     * @return bool
     */
    public function has8bitChars($text)
    {
        return (bool) preg_match(&#039;/[\x80-\xFF]/&#039;, $text);
    }

    /**
     * Encode and wrap long multibyte strings for mail headers
     * without breaking lines within a character.
     * Adapted from a function by paravoid.
     *
     * @see https://www.php.net/manual/en/function.mb-encode-mimeheader.php#60283
     *
     * @param string $str       multi-byte text to wrap encode
     * @param string $linebreak string to use as linefeed/end-of-line
     *
     * @return string
     */
    public function base64EncodeWrapMB($str, $linebreak = null)
    {
        $start = &#039;=?&#039; . $this-&gt;CharSet . &#039;?B?&#039;;
        $end = &#039;?=&#039;;
        $encoded = &#039;&#039;;
        if (null === $linebreak) {
            $linebreak = static::$LE;
        }

        $mb_length = mb_strlen($str, $this-&gt;CharSet);
        //Each line must have length &lt;= 75, including $start and $end
        $length = 75 - strlen($start) - strlen($end);
        //Average multi-byte ratio
        $ratio = $mb_length / strlen($str);
        //Base64 has a 4:3 ratio
        $avgLength = floor($length * $ratio * .75);

        $offset = 0;
        for ($i = 0; $i &lt; $mb_length; $i += $offset) {
            $lookBack = 0;
            do {
                $offset = $avgLength - $lookBack;
                $chunk = mb_substr($str, $i, $offset, $this-&gt;CharSet);
                $chunk = base64_encode($chunk);
                ++$lookBack;
            } while (strlen($chunk) &gt; $length);
            $encoded .= $chunk . $linebreak;
        }

        //Chomp the last linefeed
        return substr($encoded, 0, -strlen($linebreak));
    }

    /**
     * Encode a string in quoted-printable format.
     * According to RFC2045 section 6.7.
     *
     * @param string $string The text to encode
     *
     * @return string
     */
    public function encodeQP($string)
    {
        return static::normalizeBreaks(quoted_printable_encode($string));
    }

    /**
     * Encode a string using Q encoding.
     *
     * @see https://www.rfc-editor.org/rfc/rfc2047#section-4.2
     *
     * @param string $str      the text to encode
     * @param string $position Where the text is going to be used, see the RFC for what that means
     *
     * @return string
     */
    public function encodeQ($str, $position = &#039;text&#039;)
    {
        //There should not be any EOL in the string
        $pattern = &#039;&#039;;
        $encoded = str_replace([&quot;\r&quot;, &quot;\n&quot;], &#039;&#039;, $str);
        switch (strtolower($position)) {
            case &#039;phrase&#039;:
                //RFC 2047 section 5.3
                $pattern = &#039;^A-Za-z0-9!*+\/ -&#039;;
                break;
            /*
             * RFC 2047 section 5.2.
             * Build $pattern without including delimiters and []
             */
            /* @noinspection PhpMissingBreakStatementInspection */
            case &#039;comment&#039;:
                $pattern = &#039;\(\)&quot;&#039;;
            /* Intentional fall through */
            case &#039;text&#039;:
            default:
                //RFC 2047 section 5.1
                //Replace every high ascii, control, =, ? and _ characters
                $pattern = &#039;\000-\011\013\014\016-\037\075\077\137\177-\377&#039; . $pattern;
                break;
        }
        $matches = [];
        if (preg_match_all(&quot;/[{$pattern}]/&quot;, $encoded, $matches)) {
            //If the string contains an &#039;=&#039;, make sure it&#039;s the first thing we replace
            //so as to avoid double-encoding
            $eqkey = array_search(&#039;=&#039;, $matches[0], true);
            if (false !== $eqkey) {
                unset($matches[0][$eqkey]);
                array_unshift($matches[0], &#039;=&#039;);
            }
            foreach (array_unique($matches[0]) as $char) {
                $encoded = str_replace($char, &#039;=&#039; . sprintf(&#039;%02X&#039;, ord($char)), $encoded);
            }
        }
        //Replace spaces with _ (more readable than =20)
        //RFC 2047 section 4.2(2)
        return str_replace(&#039; &#039;, &#039;_&#039;, $encoded);
    }

    /**
     * Add a string or binary attachment (non-filesystem).
     * This method can be used to attach ascii or binary data,
     * such as a BLOB record from a database.
     *
     * @param string $string      String attachment data
     * @param string $filename    Name of the attachment
     * @param string $encoding    File encoding (see $Encoding)
     * @param string $type        File extension (MIME) type
     * @param string $disposition Disposition to use
     *
     * @throws Exception
     *
     * @return bool True on successfully adding an attachment
     */
    public function addStringAttachment(
        $string,
        $filename,
        $encoding = self::ENCODING_BASE64,
        $type = &#039;&#039;,
        $disposition = &#039;attachment&#039;
    ) {
        try {
            //If a MIME type is not specified, try to work it out from the file name
            if (&#039;&#039; === $type) {
                $type = static::filenameToType($filename);
            }

            if (!$this-&gt;validateEncoding($encoding)) {
                throw new Exception($this-&gt;lang(&#039;encoding&#039;) . $encoding);
            }

            //Append to $attachment array
            $this-&gt;attachment[] = [
                0 =&gt; $string,
                1 =&gt; $filename,
                2 =&gt; static::mb_pathinfo($filename, PATHINFO_BASENAME),
                3 =&gt; $encoding,
                4 =&gt; $type,
                5 =&gt; true, //isStringAttachment
                6 =&gt; $disposition,
                7 =&gt; 0,
            ];
        } catch (Exception $exc) {
            $this-&gt;setError($exc-&gt;getMessage());
            $this-&gt;edebug($exc-&gt;getMessage());
            if ($this-&gt;exceptions) {
                throw $exc;
            }

            return false;
        }

        return true;
    }

    /**
     * Add an embedded (inline) attachment from a file.
     * This can include images, sounds, and just about any other document type.
     * These differ from &#039;regular&#039; attachments in that they are intended to be
     * displayed inline with the message, not just attached for download.
     * This is used in HTML messages that embed the images
     * the HTML refers to using the `$cid` value in `img` tags, for example `&lt;img src=&quot;cid:mylogo&quot;&gt;`.
     * Never use a user-supplied path to a file!
     *
     * @param string $path        Path to the attachment
     * @param string $cid         Content ID of the attachment; Use this to reference
     *                            the content when using an embedded image in HTML
     * @param string $name        Overrides the attachment filename
     * @param string $encoding    File encoding (see $Encoding) defaults to `base64`
     * @param string $type        File MIME type (by default mapped from the `$path` filename&#039;s extension)
     * @param string $disposition Disposition to use: `inline` (default) or `attachment`
     *                            (unlikely you want this – {@see `addAttachment()`} instead)
     *
     * @return bool True on successfully adding an attachment
     * @throws Exception
     *
     */
    public function addEmbeddedImage(
        $path,
        $cid,
        $name = &#039;&#039;,
        $encoding = self::ENCODING_BASE64,
        $type = &#039;&#039;,
        $disposition = &#039;inline&#039;
    ) {
        try {
            if (!static::fileIsAccessible($path)) {
                throw new Exception($this-&gt;lang(&#039;file_access&#039;) . $path, self::STOP_CONTINUE);
            }

            //If a MIME type is not specified, try to work it out from the file name
            if (&#039;&#039; === $type) {
                $type = static::filenameToType($path);
            }

            if (!$this-&gt;validateEncoding($encoding)) {
                throw new Exception($this-&gt;lang(&#039;encoding&#039;) . $encoding);
            }

            $filename = (string) static::mb_pathinfo($path, PATHINFO_BASENAME);
            if (&#039;&#039; === $name) {
                $name = $filename;
            }

            //Append to $attachment array
            $this-&gt;attachment[] = [
                0 =&gt; $path,
                1 =&gt; $filename,
                2 =&gt; $name,
                3 =&gt; $encoding,
                4 =&gt; $type,
                5 =&gt; false, //isStringAttachment
                6 =&gt; $disposition,
                7 =&gt; $cid,
            ];
        } catch (Exception $exc) {
            $this-&gt;setError($exc-&gt;getMessage());
            $this-&gt;edebug($exc-&gt;getMessage());
            if ($this-&gt;exceptions) {
                throw $exc;
            }

            return false;
        }

        return true;
    }

    /**
     * Add an embedded stringified attachment.
     * This can include images, sounds, and just about any other document type.
     * If your filename doesn&#039;t contain an extension, be sure to set the $type to an appropriate MIME type.
     *
     * @param string $string      The attachment binary data
     * @param string $cid         Content ID of the attachment; Use this to reference
     *                            the content when using an embedded image in HTML
     * @param string $name        A filename for the attachment. If this contains an extension,
     *                            PHPMailer will attempt to set a MIME type for the attachment.
     *                            For example &#039;file.jpg&#039; would get an &#039;image/jpeg&#039; MIME type.
     * @param string $encoding    File encoding (see $Encoding), defaults to &#039;base64&#039;
     * @param string $type        MIME type - will be used in preference to any automatically derived type
     * @param string $disposition Disposition to use
     *
     * @throws Exception
     *
     * @return bool True on successfully adding an attachment
     */
    public function addStringEmbeddedImage(
        $string,
        $cid,
        $name = &#039;&#039;,
        $encoding = self::ENCODING_BASE64,
        $type = &#039;&#039;,
        $disposition = &#039;inline&#039;
    ) {
        try {
            //If a MIME type is not specified, try to work it out from the name
            if (&#039;&#039; === $type &amp;&amp; !empty($name)) {
                $type = static::filenameToType($name);
            }

            if (!$this-&gt;validateEncoding($encoding)) {
                throw new Exception($this-&gt;lang(&#039;encoding&#039;) . $encoding);
            }

            //Append to $attachment array
            $this-&gt;attachment[] = [
                0 =&gt; $string,
                1 =&gt; $name,
                2 =&gt; $name,
                3 =&gt; $encoding,
                4 =&gt; $type,
                5 =&gt; true, //isStringAttachment
                6 =&gt; $disposition,
                7 =&gt; $cid,
            ];
        } catch (Exception $exc) {
            $this-&gt;setError($exc-&gt;getMessage());
            $this-&gt;edebug($exc-&gt;getMessage());
            if ($this-&gt;exceptions) {
                throw $exc;
            }

            return false;
        }

        return true;
    }

    /**
     * Validate encodings.
     *
     * @param string $encoding
     *
     * @return bool
     */
    protected function validateEncoding($encoding)
    {
        return in_array(
            $encoding,
            [
                self::ENCODING_7BIT,
                self::ENCODING_QUOTED_PRINTABLE,
                self::ENCODING_BASE64,
                self::ENCODING_8BIT,
                self::ENCODING_BINARY,
            ],
            true
        );
    }

    /**
     * Check if an embedded attachment is present with this cid.
     *
     * @param string $cid
     *
     * @return bool
     */
    protected function cidExists($cid)
    {
        foreach ($this-&gt;attachment as $attachment) {
            if (&#039;inline&#039; === $attachment[6] &amp;&amp; $cid === $attachment[7]) {
                return true;
            }
        }

        return false;
    }

    /**
     * Check if an inline attachment is present.
     *
     * @return bool
     */
    public function inlineImageExists()
    {
        foreach ($this-&gt;attachment as $attachment) {
            if (&#039;inline&#039; === $attachment[6]) {
                return true;
            }
        }

        return false;
    }

    /**
     * Check if an attachment (non-inline) is present.
     *
     * @return bool
     */
    public function attachmentExists()
    {
        foreach ($this-&gt;attachment as $attachment) {
            if (&#039;attachment&#039; === $attachment[6]) {
                return true;
            }
        }

        return false;
    }

    /**
     * Check if this message has an alternative body set.
     *
     * @return bool
     */
    public function alternativeExists()
    {
        return !empty($this-&gt;AltBody);
    }

    /**
     * Clear queued addresses of given kind.
     *
     * @param string $kind &#039;to&#039;, &#039;cc&#039;, or &#039;bcc&#039;
     */
    public function clearQueuedAddresses($kind)
    {
        $this-&gt;RecipientsQueue = array_filter(
            $this-&gt;RecipientsQueue,
            static function ($params) use ($kind) {
                return $params[0] !== $kind;
            }
        );
    }

    /**
     * Clear all To recipients.
     */
    public function clearAddresses()
    {
        foreach ($this-&gt;to as $to) {
            unset($this-&gt;all_recipients[strtolower($to[0])]);
        }
        $this-&gt;to = [];
        $this-&gt;clearQueuedAddresses(&#039;to&#039;);
    }

    /**
     * Clear all CC recipients.
     */
    public function clearCCs()
    {
        foreach ($this-&gt;cc as $cc) {
            unset($this-&gt;all_recipients[strtolower($cc[0])]);
        }
        $this-&gt;cc = [];
        $this-&gt;clearQueuedAddresses(&#039;cc&#039;);
    }

    /**
     * Clear all BCC recipients.
     */
    public function clearBCCs()
    {
        foreach ($this-&gt;bcc as $bcc) {
            unset($this-&gt;all_recipients[strtolower($bcc[0])]);
        }
        $this-&gt;bcc = [];
        $this-&gt;clearQueuedAddresses(&#039;bcc&#039;);
    }

    /**
     * Clear all ReplyTo recipients.
     */
    public function clearReplyTos()
    {
        $this-&gt;ReplyTo = [];
        $this-&gt;ReplyToQueue = [];
    }

    /**
     * Clear all recipient types.
     */
    public function clearAllRecipients()
    {
        $this-&gt;to = [];
        $this-&gt;cc = [];
        $this-&gt;bcc = [];
        $this-&gt;all_recipients = [];
        $this-&gt;RecipientsQueue = [];
    }

    /**
     * Clear all filesystem, string, and binary attachments.
     */
    public function clearAttachments()
    {
        $this-&gt;attachment = [];
    }

    /**
     * Clear all custom headers.
     */
    public function clearCustomHeaders()
    {
        $this-&gt;CustomHeader = [];
    }

    /**
     * Clear a specific custom header by name or name and value.
     * $name value can be overloaded to contain
     * both header name and value (name:value).
     *
     * @param string      $name  Custom header name
     * @param string|null $value Header value
     *
     * @return bool True if a header was replaced successfully
     */
    public function clearCustomHeader($name, $value = null)
    {
        if (null === $value &amp;&amp; strpos($name, &#039;:&#039;) !== false) {
            //Value passed in as name:value
            list($name, $value) = explode(&#039;:&#039;, $name, 2);
        }
        $name = trim($name);
        $value = (null === $value) ? null : trim($value);

        foreach ($this-&gt;CustomHeader as $k =&gt; $pair) {
            if ($pair[0] == $name) {
                // We remove the header if the value is not provided or it matches.
                if (null === $value ||  $pair[1] == $value) {
                    unset($this-&gt;CustomHeader[$k]);
                }
            }
        }

        return true;
    }

    /**
     * Replace a custom header.
     * $name value can be overloaded to contain
     * both header name and value (name:value).
     *
     * @param string      $name  Custom header name
     * @param string|null $value Header value
     *
     * @return bool True if a header was replaced successfully
     * @throws Exception
     */
    public function replaceCustomHeader($name, $value = null)
    {
        if (null === $value &amp;&amp; strpos($name, &#039;:&#039;) !== false) {
            //Value passed in as name:value
            list($name, $value) = explode(&#039;:&#039;, $name, 2);
        }
        $name = trim($name);
        $value = (null === $value) ? &#039;&#039; : trim($value);

        $replaced = false;
        foreach ($this-&gt;CustomHeader as $k =&gt; $pair) {
            if ($pair[0] == $name) {
                if ($replaced) {
                    unset($this-&gt;CustomHeader[$k]);
                    continue;
                }
                if (strpbrk($name . $value, &quot;\r\n&quot;) !== false) {
                    if ($this-&gt;exceptions) {
                        throw new Exception($this-&gt;lang(&#039;invalid_header&#039;));
                    }

                    return false;
                }
                $this-&gt;CustomHeader[$k] = [$name, $value];
                $replaced = true;
            }
        }

        return true;
    }

    /**
     * Add an error message to the error container.
     *
     * @param string $msg
     */
    protected function setError($msg)
    {
        ++$this-&gt;error_count;
        if (&#039;smtp&#039; === $this-&gt;Mailer &amp;&amp; null !== $this-&gt;smtp) {
            $lasterror = $this-&gt;smtp-&gt;getError();
            if (!empty($lasterror[&#039;error&#039;])) {
                $msg .= $this-&gt;lang(&#039;smtp_error&#039;) . $lasterror[&#039;error&#039;];
                if (!empty($lasterror[&#039;detail&#039;])) {
                    $msg .= &#039; &#039; . $this-&gt;lang(&#039;smtp_detail&#039;) . $lasterror[&#039;detail&#039;];
                }
                if (!empty($lasterror[&#039;smtp_code&#039;])) {
                    $msg .= &#039; &#039; . $this-&gt;lang(&#039;smtp_code&#039;) . $lasterror[&#039;smtp_code&#039;];
                }
                if (!empty($lasterror[&#039;smtp_code_ex&#039;])) {
                    $msg .= &#039; &#039; . $this-&gt;lang(&#039;smtp_code_ex&#039;) . $lasterror[&#039;smtp_code_ex&#039;];
                }
            }
        }
        $this-&gt;ErrorInfo = $msg;
    }

    /**
     * Return an RFC 822 formatted date.
     *
     * @return string
     */
    public static function rfcDate()
    {
        //Set the time zone to whatever the default is to avoid 500 errors
        //Will default to UTC if it&#039;s not set properly in php.ini
        date_default_timezone_set(@date_default_timezone_get());

        return date(&#039;D, j M Y H:i:s O&#039;);
    }

    /**
     * Get the server hostname.
     * Returns &#039;localhost.localdomain&#039; if unknown.
     *
     * @return string
     */
    protected function serverHostname()
    {
        $result = &#039;&#039;;
        if (!empty($this-&gt;Hostname)) {
            $result = $this-&gt;Hostname;
        } elseif (isset($_SERVER) &amp;&amp; array_key_exists(&#039;SERVER_NAME&#039;, $_SERVER)) {
            $result = $_SERVER[&#039;SERVER_NAME&#039;];
        } elseif (function_exists(&#039;gethostname&#039;) &amp;&amp; gethostname() !== false) {
            $result = gethostname();
        } elseif (php_uname(&#039;n&#039;) !== &#039;&#039;) {
            $result = php_uname(&#039;n&#039;);
        }
        if (!static::isValidHost($result)) {
            return &#039;localhost.localdomain&#039;;
        }

        return $result;
    }

    /**
     * Validate whether a string contains a valid value to use as a hostname or IP address.
     * IPv6 addresses must include [], e.g. `[::1]`, not just `::1`.
     *
     * @param string $host The host name or IP address to check
     *
     * @return bool
     */
    public static function isValidHost($host)
    {
        //Simple syntax limits
        if (
            empty($host)
            || !is_string($host)
            || strlen($host) &gt; 256
            || !preg_match(&#039;/^([a-z\d.-]*|\[[a-f\d:]+\])$/i&#039;, $host)
        ) {
            return false;
        }
        //Looks like a bracketed IPv6 address
        if (strlen($host) &gt; 2 &amp;&amp; substr($host, 0, 1) === &#039;[&#039; &amp;&amp; substr($host, -1, 1) === &#039;]&#039;) {
            return filter_var(substr($host, 1, -1), FILTER_VALIDATE_IP, FILTER_FLAG_IPV6) !== false;
        }
        //If removing all the dots results in a numeric string, it must be an IPv4 address.
        //Need to check this first because otherwise things like `999.0.0.0` are considered valid host names
        if (is_numeric(str_replace(&#039;.&#039;, &#039;&#039;, $host))) {
            //Is it a valid IPv4 address?
            return filter_var($host, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4) !== false;
        }
        //Is it a syntactically valid hostname (when embedded in a URL)?
        return filter_var(&#039;https://&#039; . $host, FILTER_VALIDATE_URL) !== false;
    }

    /**
     * Get an error message in the current language.
     *
     * @param string $key
     *
     * @return string
     */
    protected function lang($key)
    {
        if (count($this-&gt;language) &lt; 1) {
            $this-&gt;setLanguage(); //Set the default language
        }

        if (array_key_exists($key, $this-&gt;language)) {
            if (&#039;smtp_connect_failed&#039; === $key) {
                //Include a link to troubleshooting docs on SMTP connection failure.
                //This is by far the biggest cause of support questions
                //but it&#039;s usually not PHPMailer&#039;s fault.
                return $this-&gt;language[$key] . &#039; https://github.com/PHPMailer/PHPMailer/wiki/Troubleshooting&#039;;
            }

            return $this-&gt;language[$key];
        }

        //Return the key as a fallback
        return $key;
    }

    /**
     * Build an error message starting with a generic one and adding details if possible.
     *
     * @param string $base_key
     * @return string
     */
    private function getSmtpErrorMessage($base_key)
    {
        $message = $this-&gt;lang($base_key);
        $error = $this-&gt;smtp-&gt;getError();
        if (!empty($error[&#039;error&#039;])) {
            $message .= &#039; &#039; . $error[&#039;error&#039;];
            if (!empty($error[&#039;detail&#039;])) {
                $message .= &#039; &#039; . $error[&#039;detail&#039;];
            }
        }

        return $message;
    }

    /**
     * Check if an error occurred.
     *
     * @return bool True if an error did occur
     */
    public function isError()
    {
        return $this-&gt;error_count &gt; 0;
    }

    /**
     * Add a custom header.
     * $name value can be overloaded to contain
     * both header name and value (name:value).
     *
     * @param string      $name  Custom header name
     * @param string|null $value Header value
     *
     * @return bool True if a header was set successfully
     * @throws Exception
     */
    public function addCustomHeader($name, $value = null)
    {
        if (null === $value &amp;&amp; strpos($name, &#039;:&#039;) !== false) {
            //Value passed in as name:value
            list($name, $value) = explode(&#039;:&#039;, $name, 2);
        }
        $name = trim($name);
        $value = (null === $value) ? &#039;&#039; : trim($value);
        //Ensure name is not empty, and that neither name nor value contain line breaks
        if (empty($name) || strpbrk($name . $value, &quot;\r\n&quot;) !== false) {
            if ($this-&gt;exceptions) {
                throw new Exception($this-&gt;lang(&#039;invalid_header&#039;));
            }

            return false;
        }
        $this-&gt;CustomHeader[] = [$name, $value];

        return true;
    }

    /**
     * Returns all custom headers.
     *
     * @return array
     */
    public function getCustomHeaders()
    {
        return $this-&gt;CustomHeader;
    }

    /**
     * Create a message body from an HTML string.
     * Automatically inlines images and creates a plain-text version by converting the HTML,
     * overwriting any existing values in Body and AltBody.
     * Do not source $message content from user input!
     * $basedir is prepended when handling relative URLs, e.g. &lt;img src=&quot;/images/a.png&quot;&gt; and must not be empty
     * will look for an image file in $basedir/images/a.png and convert it to inline.
     * If you don&#039;t provide a $basedir, relative paths will be left untouched (and thus probably break in email)
     * Converts data-uri images into embedded attachments.
     * If you don&#039;t want to apply these transformations to your HTML, just set Body and AltBody directly.
     *
     * @param string        $message  HTML message string
     * @param string        $basedir  Absolute path to a base directory to prepend to relative paths to images
     * @param bool|callable $advanced Whether to use the internal HTML to text converter
     *                                or your own custom converter
     * @return string The transformed message body
     *
     * @throws Exception
     *
     * @see PHPMailer::html2text()
     */
    public function msgHTML($message, $basedir = &#039;&#039;, $advanced = false)
    {
        preg_match_all(&#039;/(?&lt;!-)(src|background)=[&quot;\&#039;](.*)[&quot;\&#039;]/Ui&#039;, $message, $images);
        if (array_key_exists(2, $images)) {
            if (strlen($basedir) &gt; 1 &amp;&amp; &#039;/&#039; !== substr($basedir, -1)) {
                //Ensure $basedir has a trailing /
                $basedir .= &#039;/&#039;;
            }
            foreach ($images[2] as $imgindex =&gt; $url) {
                //Convert data URIs into embedded images
                //e.g. &quot;data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==&quot;
                $match = [];
                if (preg_match(&#039;#^data:(image/(?:jpe?g|gif|png));?(base64)?,(.+)#&#039;, $url, $match)) {
                    if (count($match) === 4 &amp;&amp; static::ENCODING_BASE64 === $match[2]) {
                        $data = base64_decode($match[3]);
                    } elseif (&#039;&#039; === $match[2]) {
                        $data = rawurldecode($match[3]);
                    } else {
                        //Not recognised so leave it alone
                        continue;
                    }
                    //Hash the decoded data, not the URL, so that the same data-URI image used in multiple places
                    //will only be embedded once, even if it used a different encoding
                    $cid = substr(hash(&#039;sha256&#039;, $data), 0, 32) . &#039;@phpmailer.0&#039;; //RFC2392 S 2

                    if (!$this-&gt;cidExists($cid)) {
                        $this-&gt;addStringEmbeddedImage(
                            $data,
                            $cid,
                            &#039;embed&#039; . $imgindex,
                            static::ENCODING_BASE64,
                            $match[1]
                        );
                    }
                    $message = str_replace(
                        $images[0][$imgindex],
                        $images[1][$imgindex] . &#039;=&quot;cid:&#039; . $cid . &#039;&quot;&#039;,
                        $message
                    );
                    continue;
                }
                if (
                    //Only process relative URLs if a basedir is provided (i.e. no absolute local paths)
                    !empty($basedir)
                    //Ignore URLs containing parent dir traversal (..)
                    &amp;&amp; (strpos($url, &#039;..&#039;) === false)
                    //Do not change urls that are already inline images
                    &amp;&amp; 0 !== strpos($url, &#039;cid:&#039;)
                    //Do not change absolute URLs, including anonymous protocol
                    &amp;&amp; !preg_match(&#039;#^[a-z][a-z0-9+.-]*:?//#i&#039;, $url)
                ) {
                    $filename = static::mb_pathinfo($url, PATHINFO_BASENAME);
                    $directory = dirname($url);
                    if (&#039;.&#039; === $directory) {
                        $directory = &#039;&#039;;
                    }
                    //RFC2392 S 2
                    $cid = substr(hash(&#039;sha256&#039;, $url), 0, 32) . &#039;@phpmailer.0&#039;;
                    if (strlen($basedir) &gt; 1 &amp;&amp; &#039;/&#039; !== substr($basedir, -1)) {
                        $basedir .= &#039;/&#039;;
                    }
                    if (strlen($directory) &gt; 1 &amp;&amp; &#039;/&#039; !== substr($directory, -1)) {
                        $directory .= &#039;/&#039;;
                    }
                    if (
                        $this-&gt;addEmbeddedImage(
                            $basedir . $directory . $filename,
                            $cid,
                            $filename,
                            static::ENCODING_BASE64,
                            static::_mime_types((string) static::mb_pathinfo($filename, PATHINFO_EXTENSION))
                        )
                    ) {
                        $message = preg_replace(
                            &#039;/&#039; . $images[1][$imgindex] . &#039;=[&quot;\&#039;]&#039; . preg_quote($url, &#039;/&#039;) . &#039;[&quot;\&#039;]/Ui&#039;,
                            $images[1][$imgindex] . &#039;=&quot;cid:&#039; . $cid . &#039;&quot;&#039;,
                            $message
                        );
                    }
                }
            }
        }
        $this-&gt;isHTML();
        //Convert all message body line breaks to LE, makes quoted-printable encoding work much better
        $this-&gt;Body = static::normalizeBreaks($message);
        $this-&gt;AltBody = static::normalizeBreaks($this-&gt;html2text($message, $advanced));
        if (!$this-&gt;alternativeExists()) {
            $this-&gt;AltBody = &#039;This is an HTML-only message. To view it, activate HTML in your email application.&#039;
                . static::$LE;
        }

        return $this-&gt;Body;
    }

    /**
     * Convert an HTML string into plain text.
     * This is used by msgHTML().
     * Note - older versions of this function used a bundled advanced converter
     * which was removed for license reasons in #232.
     * Example usage:
     *
     * ```php
     * //Use default conversion
     * $plain = $mail-&gt;html2text($html);
     * //Use your own custom converter
     * $plain = $mail-&gt;html2text($html, function($html) {
     *     $converter = new MyHtml2text($html);
     *     return $converter-&gt;get_text();
     * });
     * ```
     *
     * @param string        $html     The HTML text to convert
     * @param bool|callable $advanced Any boolean value to use the internal converter,
     *                                or provide your own callable for custom conversion.
     *                                *Never* pass user-supplied data into this parameter
     *
     * @return string
     */
    public function html2text($html, $advanced = false)
    {
        if (is_callable($advanced)) {
            return call_user_func($advanced, $html);
        }

        return html_entity_decode(
            trim(strip_tags(preg_replace(&#039;/&lt;(head|title|style|script)[^&gt;]*&gt;.*?&lt;\/\\1&gt;/si&#039;, &#039;&#039;, $html))),
            ENT_QUOTES,
            $this-&gt;CharSet
        );
    }

    /**
     * Get the MIME type for a file extension.
     *
     * @param string $ext File extension
     *
     * @return string MIME type of file
     */
    public static function _mime_types($ext = &#039;&#039;)
    {
        $mimes = [
            &#039;xl&#039; =&gt; &#039;application/excel&#039;,
            &#039;js&#039; =&gt; &#039;application/javascript&#039;,
            &#039;hqx&#039; =&gt; &#039;application/mac-binhex40&#039;,
            &#039;cpt&#039; =&gt; &#039;application/mac-compactpro&#039;,
            &#039;bin&#039; =&gt; &#039;application/macbinary&#039;,
            &#039;doc&#039; =&gt; &#039;application/msword&#039;,
            &#039;word&#039; =&gt; &#039;application/msword&#039;,
            &#039;xlsx&#039; =&gt; &#039;application/vnd.openxmlformats-officedocument.spreadsheetml.sheet&#039;,
            &#039;xltx&#039; =&gt; &#039;application/vnd.openxmlformats-officedocument.spreadsheetml.template&#039;,
            &#039;potx&#039; =&gt; &#039;application/vnd.openxmlformats-officedocument.presentationml.template&#039;,
            &#039;ppsx&#039; =&gt; &#039;application/vnd.openxmlformats-officedocument.presentationml.slideshow&#039;,
            &#039;pptx&#039; =&gt; &#039;application/vnd.openxmlformats-officedocument.presentationml.presentation&#039;,
            &#039;sldx&#039; =&gt; &#039;application/vnd.openxmlformats-officedocument.presentationml.slide&#039;,
            &#039;docx&#039; =&gt; &#039;application/vnd.openxmlformats-officedocument.wordprocessingml.document&#039;,
            &#039;dotx&#039; =&gt; &#039;application/vnd.openxmlformats-officedocument.wordprocessingml.template&#039;,
            &#039;xlam&#039; =&gt; &#039;application/vnd.ms-excel.addin.macroEnabled.12&#039;,
            &#039;xlsb&#039; =&gt; &#039;application/vnd.ms-excel.sheet.binary.macroEnabled.12&#039;,
            &#039;class&#039; =&gt; &#039;application/octet-stream&#039;,
            &#039;dll&#039; =&gt; &#039;application/octet-stream&#039;,
            &#039;dms&#039; =&gt; &#039;application/octet-stream&#039;,
            &#039;exe&#039; =&gt; &#039;application/octet-stream&#039;,
            &#039;lha&#039; =&gt; &#039;application/octet-stream&#039;,
            &#039;lzh&#039; =&gt; &#039;application/octet-stream&#039;,
            &#039;psd&#039; =&gt; &#039;application/octet-stream&#039;,
            &#039;sea&#039; =&gt; &#039;application/octet-stream&#039;,
            &#039;so&#039; =&gt; &#039;application/octet-stream&#039;,
            &#039;oda&#039; =&gt; &#039;application/oda&#039;,
            &#039;pdf&#039; =&gt; &#039;application/pdf&#039;,
            &#039;ai&#039; =&gt; &#039;application/postscript&#039;,
            &#039;eps&#039; =&gt; &#039;application/postscript&#039;,
            &#039;ps&#039; =&gt; &#039;application/postscript&#039;,
            &#039;smi&#039; =&gt; &#039;application/smil&#039;,
            &#039;smil&#039; =&gt; &#039;application/smil&#039;,
            &#039;mif&#039; =&gt; &#039;application/vnd.mif&#039;,
            &#039;xls&#039; =&gt; &#039;application/vnd.ms-excel&#039;,
            &#039;ppt&#039; =&gt; &#039;application/vnd.ms-powerpoint&#039;,
            &#039;wbxml&#039; =&gt; &#039;application/vnd.wap.wbxml&#039;,
            &#039;wmlc&#039; =&gt; &#039;application/vnd.wap.wmlc&#039;,
            &#039;dcr&#039; =&gt; &#039;application/x-director&#039;,
            &#039;dir&#039; =&gt; &#039;application/x-director&#039;,
            &#039;dxr&#039; =&gt; &#039;application/x-director&#039;,
            &#039;dvi&#039; =&gt; &#039;application/x-dvi&#039;,
            &#039;gtar&#039; =&gt; &#039;application/x-gtar&#039;,
            &#039;php3&#039; =&gt; &#039;application/x-httpd-php&#039;,
            &#039;php4&#039; =&gt; &#039;application/x-httpd-php&#039;,
            &#039;php&#039; =&gt; &#039;application/x-httpd-php&#039;,
            &#039;phtml&#039; =&gt; &#039;application/x-httpd-php&#039;,
            &#039;phps&#039; =&gt; &#039;application/x-httpd-php-source&#039;,
            &#039;swf&#039; =&gt; &#039;application/x-shockwave-flash&#039;,
            &#039;sit&#039; =&gt; &#039;application/x-stuffit&#039;,
            &#039;tar&#039; =&gt; &#039;application/x-tar&#039;,
            &#039;tgz&#039; =&gt; &#039;application/x-tar&#039;,
            &#039;xht&#039; =&gt; &#039;application/xhtml+xml&#039;,
            &#039;xhtml&#039; =&gt; &#039;application/xhtml+xml&#039;,
            &#039;zip&#039; =&gt; &#039;application/zip&#039;,
            &#039;mid&#039; =&gt; &#039;audio/midi&#039;,
            &#039;midi&#039; =&gt; &#039;audio/midi&#039;,
            &#039;mp2&#039; =&gt; &#039;audio/mpeg&#039;,
            &#039;mp3&#039; =&gt; &#039;audio/mpeg&#039;,
            &#039;m4a&#039; =&gt; &#039;audio/mp4&#039;,
            &#039;mpga&#039; =&gt; &#039;audio/mpeg&#039;,
            &#039;aif&#039; =&gt; &#039;audio/x-aiff&#039;,
            &#039;aifc&#039; =&gt; &#039;audio/x-aiff&#039;,
            &#039;aiff&#039; =&gt; &#039;audio/x-aiff&#039;,
            &#039;ram&#039; =&gt; &#039;audio/x-pn-realaudio&#039;,
            &#039;rm&#039; =&gt; &#039;audio/x-pn-realaudio&#039;,
            &#039;rpm&#039; =&gt; &#039;audio/x-pn-realaudio-plugin&#039;,
            &#039;ra&#039; =&gt; &#039;audio/x-realaudio&#039;,
            &#039;wav&#039; =&gt; &#039;audio/x-wav&#039;,
            &#039;mka&#039; =&gt; &#039;audio/x-matroska&#039;,
            &#039;bmp&#039; =&gt; &#039;image/bmp&#039;,
            &#039;gif&#039; =&gt; &#039;image/gif&#039;,
            &#039;jpeg&#039; =&gt; &#039;image/jpeg&#039;,
            &#039;jpe&#039; =&gt; &#039;image/jpeg&#039;,
            &#039;jpg&#039; =&gt; &#039;image/jpeg&#039;,
            &#039;png&#039; =&gt; &#039;image/png&#039;,
            &#039;tiff&#039; =&gt; &#039;image/tiff&#039;,
            &#039;tif&#039; =&gt; &#039;image/tiff&#039;,
            &#039;webp&#039; =&gt; &#039;image/webp&#039;,
            &#039;avif&#039; =&gt; &#039;image/avif&#039;,
            &#039;heif&#039; =&gt; &#039;image/heif&#039;,
            &#039;heifs&#039; =&gt; &#039;image/heif-sequence&#039;,
            &#039;heic&#039; =&gt; &#039;image/heic&#039;,
            &#039;heics&#039; =&gt; &#039;image/heic-sequence&#039;,
            &#039;eml&#039; =&gt; &#039;message/rfc822&#039;,
            &#039;css&#039; =&gt; &#039;text/css&#039;,
            &#039;html&#039; =&gt; &#039;text/html&#039;,
            &#039;htm&#039; =&gt; &#039;text/html&#039;,
            &#039;shtml&#039; =&gt; &#039;text/html&#039;,
            &#039;log&#039; =&gt; &#039;text/plain&#039;,
            &#039;text&#039; =&gt; &#039;text/plain&#039;,
            &#039;txt&#039; =&gt; &#039;text/plain&#039;,
            &#039;rtx&#039; =&gt; &#039;text/richtext&#039;,
            &#039;rtf&#039; =&gt; &#039;text/rtf&#039;,
            &#039;vcf&#039; =&gt; &#039;text/vcard&#039;,
            &#039;vcard&#039; =&gt; &#039;text/vcard&#039;,
            &#039;ics&#039; =&gt; &#039;text/calendar&#039;,
            &#039;xml&#039; =&gt; &#039;text/xml&#039;,
            &#039;xsl&#039; =&gt; &#039;text/xml&#039;,
            &#039;csv&#039; =&gt; &#039;text/csv&#039;,
            &#039;wmv&#039; =&gt; &#039;video/x-ms-wmv&#039;,
            &#039;mpeg&#039; =&gt; &#039;video/mpeg&#039;,
            &#039;mpe&#039; =&gt; &#039;video/mpeg&#039;,
            &#039;mpg&#039; =&gt; &#039;video/mpeg&#039;,
            &#039;mp4&#039; =&gt; &#039;video/mp4&#039;,
            &#039;m4v&#039; =&gt; &#039;video/mp4&#039;,
            &#039;mov&#039; =&gt; &#039;video/quicktime&#039;,
            &#039;qt&#039; =&gt; &#039;video/quicktime&#039;,
            &#039;rv&#039; =&gt; &#039;video/vnd.rn-realvideo&#039;,
            &#039;avi&#039; =&gt; &#039;video/x-msvideo&#039;,
            &#039;movie&#039; =&gt; &#039;video/x-sgi-movie&#039;,
            &#039;webm&#039; =&gt; &#039;video/webm&#039;,
            &#039;mkv&#039; =&gt; &#039;video/x-matroska&#039;,
        ];
        $ext = strtolower($ext);
        if (array_key_exists($ext, $mimes)) {
            return $mimes[$ext];
        }

        return &#039;application/octet-stream&#039;;
    }

    /**
     * Map a file name to a MIME type.
     * Defaults to &#039;application/octet-stream&#039;, i.e.. arbitrary binary data.
     *
     * @param string $filename A file name or full path, does not need to exist as a file
     *
     * @return string
     */
    public static function filenameToType($filename)
    {
        //In case the path is a URL, strip any query string before getting extension
        $qpos = strpos($filename, &#039;?&#039;);
        if (false !== $qpos) {
            $filename = substr($filename, 0, $qpos);
        }
        $ext = static::mb_pathinfo($filename, PATHINFO_EXTENSION);

        return static::_mime_types($ext);
    }

    /**
     * Multi-byte-safe pathinfo replacement.
     * Drop-in replacement for pathinfo(), but multibyte- and cross-platform-safe.
     *
     * @see https://www.php.net/manual/en/function.pathinfo.php#107461
     *
     * @param string     $path    A filename or path, does not need to exist as a file
     * @param int|string $options Either a PATHINFO_* constant,
     *                            or a string name to return only the specified piece
     *
     * @return string|array
     */
    public static function mb_pathinfo($path, $options = null)
    {
        $ret = [&#039;dirname&#039; =&gt; &#039;&#039;, &#039;basename&#039; =&gt; &#039;&#039;, &#039;extension&#039; =&gt; &#039;&#039;, &#039;filename&#039; =&gt; &#039;&#039;];
        $pathinfo = [];
        if (preg_match(&#039;#^(.*?)[\\\\/]*(([^/\\\\]*?)(\.([^.\\\\/]+?)|))[\\\\/.]*$#m&#039;, $path, $pathinfo)) {
            if (array_key_exists(1, $pathinfo)) {
                $ret[&#039;dirname&#039;] = $pathinfo[1];
            }
            if (array_key_exists(2, $pathinfo)) {
                $ret[&#039;basename&#039;] = $pathinfo[2];
            }
            if (array_key_exists(5, $pathinfo)) {
                $ret[&#039;extension&#039;] = $pathinfo[5];
            }
            if (array_key_exists(3, $pathinfo)) {
                $ret[&#039;filename&#039;] = $pathinfo[3];
            }
        }
        switch ($options) {
            case PATHINFO_DIRNAME:
            case &#039;dirname&#039;:
                return $ret[&#039;dirname&#039;];
            case PATHINFO_BASENAME:
            case &#039;basename&#039;:
                return $ret[&#039;basename&#039;];
            case PATHINFO_EXTENSION:
            case &#039;extension&#039;:
                return $ret[&#039;extension&#039;];
            case PATHINFO_FILENAME:
            case &#039;filename&#039;:
                return $ret[&#039;filename&#039;];
            default:
                return $ret;
        }
    }

    /**
     * Set or reset instance properties.
     * You should avoid this function - it&#039;s more verbose, less efficient, more error-prone and
     * harder to debug than setting properties directly.
     * Usage Example:
     * `$mail-&gt;set(&#039;SMTPSecure&#039;, static::ENCRYPTION_STARTTLS);`
     *   is the same as:
     * `$mail-&gt;SMTPSecure = static::ENCRYPTION_STARTTLS;`.
     *
     * @param string $name  The property name to set
     * @param mixed  $value The value to set the property to
     *
     * @return bool
     */
    public function set($name, $value = &#039;&#039;)
    {
        if (property_exists($this, $name)) {
            $this-&gt;{$name} = $value;

            return true;
        }
        $this-&gt;setError($this-&gt;lang(&#039;variable_set&#039;) . $name);

        return false;
    }

    /**
     * Strip newlines to prevent header injection.
     *
     * @param string $str
     *
     * @return string
     */
    public function secureHeader($str)
    {
        return trim(str_replace([&quot;\r&quot;, &quot;\n&quot;], &#039;&#039;, $str));
    }

    /**
     * Normalize line breaks in a string.
     * Converts UNIX LF, Mac CR and Windows CRLF line breaks into a single line break format.
     * Defaults to CRLF (for message bodies) and preserves consecutive breaks.
     *
     * @param string $text
     * @param string $breaktype What kind of line break to use; defaults to static::$LE
     *
     * @return string
     */
    public static function normalizeBreaks($text, $breaktype = null)
    {
        if (null === $breaktype) {
            $breaktype = static::$LE;
        }
        //Normalise to \n
        $text = str_replace([self::CRLF, &quot;\r&quot;], &quot;\n&quot;, $text);
        //Now convert LE as needed
        if (&quot;\n&quot; !== $breaktype) {
            $text = str_replace(&quot;\n&quot;, $breaktype, $text);
        }

        return $text;
    }

    /**
     * Remove trailing whitespace from a string.
     *
     * @param string $text
     *
     * @return string The text to remove whitespace from
     */
    public static function stripTrailingWSP($text)
    {
        return rtrim($text, &quot; \r\n\t&quot;);
    }

    /**
     * Strip trailing line breaks from a string.
     *
     * @param string $text
     *
     * @return string The text to remove breaks from
     */
    public static function stripTrailingBreaks($text)
    {
        return rtrim($text, &quot;\r\n&quot;);
    }

    /**
     * Return the current line break format string.
     *
     * @return string
     */
    public static function getLE()
    {
        return static::$LE;
    }

    /**
     * Set the line break format string, e.g. &quot;\r\n&quot;.
     *
     * @param string $le
     */
    protected static function setLE($le)
    {
        static::$LE = $le;
    }

    /**
     * Set the public and private key files and password for S/MIME signing.
     *
     * @param string $cert_filename
     * @param string $key_filename
     * @param string $key_pass            Password for private key
     * @param string $extracerts_filename Optional path to chain certificate
     */
    public function sign($cert_filename, $key_filename, $key_pass, $extracerts_filename = &#039;&#039;)
    {
        $this-&gt;sign_cert_file = $cert_filename;
        $this-&gt;sign_key_file = $key_filename;
        $this-&gt;sign_key_pass = $key_pass;
        $this-&gt;sign_extracerts_file = $extracerts_filename;
    }

    /**
     * Quoted-Printable-encode a DKIM header.
     *
     * @param string $txt
     *
     * @return string
     */
    public function DKIM_QP($txt)
    {
        $line = &#039;&#039;;
        $len = strlen($txt);
        for ($i = 0; $i &lt; $len; ++$i) {
            $ord = ord($txt[$i]);
            if (((0x21 &lt;= $ord) &amp;&amp; ($ord &lt;= 0x3A)) || $ord === 0x3C || ((0x3E &lt;= $ord) &amp;&amp; ($ord &lt;= 0x7E))) {
                $line .= $txt[$i];
            } else {
                $line .= &#039;=&#039; . sprintf(&#039;%02X&#039;, $ord);
            }
        }

        return $line;
    }

    /**
     * Generate a DKIM signature.
     *
     * @param string $signHeader
     *
     * @throws Exception
     *
     * @return string The DKIM signature value
     */
    public function DKIM_Sign($signHeader)
    {
        if (!defined(&#039;PKCS7_TEXT&#039;)) {
            if ($this-&gt;exceptions) {
                throw new Exception($this-&gt;lang(&#039;extension_missing&#039;) . &#039;openssl&#039;);
            }

            return &#039;&#039;;
        }
        $privKeyStr = !empty($this-&gt;DKIM_private_string) ?
            $this-&gt;DKIM_private_string :
            file_get_contents($this-&gt;DKIM_private);
        if (&#039;&#039; !== $this-&gt;DKIM_passphrase) {
            $privKey = openssl_pkey_get_private($privKeyStr, $this-&gt;DKIM_passphrase);
        } else {
            $privKey = openssl_pkey_get_private($privKeyStr);
        }
        if (openssl_sign($signHeader, $signature, $privKey, &#039;sha256WithRSAEncryption&#039;)) {
            if (\PHP_MAJOR_VERSION &lt; 8) {
                openssl_pkey_free($privKey);
            }

            return base64_encode($signature);
        }
        if (\PHP_MAJOR_VERSION &lt; 8) {
            openssl_pkey_free($privKey);
        }

        return &#039;&#039;;
    }

    /**
     * Generate a DKIM canonicalization header.
     * Uses the &#039;relaxed&#039; algorithm from RFC6376 section 3.4.2.
     * Canonicalized headers should *always* use CRLF, regardless of mailer setting.
     *
     * @see https://www.rfc-editor.org/rfc/rfc6376#section-3.4.2
     *
     * @param string $signHeader Header
     *
     * @return string
     */
    public function DKIM_HeaderC($signHeader)
    {
        //Normalize breaks to CRLF (regardless of the mailer)
        $signHeader = static::normalizeBreaks($signHeader, self::CRLF);
        //Unfold header lines
        //Note PCRE \s is too broad a definition of whitespace; RFC5322 defines it as `[ \t]`
        //@see https://www.rfc-editor.org/rfc/rfc5322#section-2.2
        //That means this may break if you do something daft like put vertical tabs in your headers.
        $signHeader = preg_replace(&#039;/\r\n[ \t]+/&#039;, &#039; &#039;, $signHeader);
        //Break headers out into an array
        $lines = explode(self::CRLF, $signHeader);
        foreach ($lines as $key =&gt; $line) {
            //If the header is missing a :, skip it as it&#039;s invalid
            //This is likely to happen because the explode() above will also split
            //on the trailing LE, leaving an empty line
            if (strpos($line, &#039;:&#039;) === false) {
                continue;
            }
            list($heading, $value) = explode(&#039;:&#039;, $line, 2);
            //Lower-case header name
            $heading = strtolower($heading);
            //Collapse white space within the value, also convert WSP to space
            $value = preg_replace(&#039;/[ \t]+/&#039;, &#039; &#039;, $value);
            //RFC6376 is slightly unclear here - it says to delete space at the *end* of each value
            //But then says to delete space before and after the colon.
            //Net result is the same as trimming both ends of the value.
            //By elimination, the same applies to the field name
            $lines[$key] = trim($heading, &quot; \t&quot;) . &#039;:&#039; . trim($value, &quot; \t&quot;);
        }

        return implode(self::CRLF, $lines);
    }

    /**
     * Generate a DKIM canonicalization body.
     * Uses the &#039;simple&#039; algorithm from RFC6376 section 3.4.3.
     * Canonicalized bodies should *always* use CRLF, regardless of mailer setting.
     *
     * @see https://www.rfc-editor.org/rfc/rfc6376#section-3.4.3
     *
     * @param string $body Message Body
     *
     * @return string
     */
    public function DKIM_BodyC($body)
    {
        if (empty($body)) {
            return self::CRLF;
        }
        //Normalize line endings to CRLF
        $body = static::normalizeBreaks($body, self::CRLF);

        //Reduce multiple trailing line breaks to a single one
        return static::stripTrailingBreaks($body) . self::CRLF;
    }

    /**
     * Create the DKIM header and body in a new message header.
     *
     * @param string $headers_line Header lines
     * @param string $subject      Subject
     * @param string $body         Body
     *
     * @throws Exception
     *
     * @return string
     */
    public function DKIM_Add($headers_line, $subject, $body)
    {
        $DKIMsignatureType = &#039;rsa-sha256&#039;; //Signature &amp; hash algorithms
        $DKIMcanonicalization = &#039;relaxed/simple&#039;; //Canonicalization methods of header &amp; body
        $DKIMquery = &#039;dns/txt&#039;; //Query method
        $DKIMtime = time();
        //Always sign these headers without being asked
        //Recommended list from https://www.rfc-editor.org/rfc/rfc6376#section-5.4.1
        $autoSignHeaders = [
            &#039;from&#039;,
            &#039;to&#039;,
            &#039;cc&#039;,
            &#039;date&#039;,
            &#039;subject&#039;,
            &#039;reply-to&#039;,
            &#039;message-id&#039;,
            &#039;content-type&#039;,
            &#039;mime-version&#039;,
            &#039;x-mailer&#039;,
        ];
        if (stripos($headers_line, &#039;Subject&#039;) === false) {
            $headers_line .= &#039;Subject: &#039; . $subject . static::$LE;
        }
        $headerLines = explode(static::$LE, $headers_line);
        $currentHeaderLabel = &#039;&#039;;
        $currentHeaderValue = &#039;&#039;;
        $parsedHeaders = [];
        $headerLineIndex = 0;
        $headerLineCount = count($headerLines);
        foreach ($headerLines as $headerLine) {
            $matches = [];
            if (preg_match(&#039;/^([^ \t]*?)(?::[ \t]*)(.*)$/&#039;, $headerLine, $matches)) {
                if ($currentHeaderLabel !== &#039;&#039;) {
                    //We were previously in another header; This is the start of a new header, so save the previous one
                    $parsedHeaders[] = [&#039;label&#039; =&gt; $currentHeaderLabel, &#039;value&#039; =&gt; $currentHeaderValue];
                }
                $currentHeaderLabel = $matches[1];
                $currentHeaderValue = $matches[2];
            } elseif (preg_match(&#039;/^[ \t]+(.*)$/&#039;, $headerLine, $matches)) {
                //This is a folded continuation of the current header, so unfold it
                $currentHeaderValue .= &#039; &#039; . $matches[1];
            }
            ++$headerLineIndex;
            if ($headerLineIndex &gt;= $headerLineCount) {
                //This was the last line, so finish off this header
                $parsedHeaders[] = [&#039;label&#039; =&gt; $currentHeaderLabel, &#039;value&#039; =&gt; $currentHeaderValue];
            }
        }
        $copiedHeaders = [];
        $headersToSignKeys = [];
        $headersToSign = [];
        foreach ($parsedHeaders as $header) {
            //Is this header one that must be included in the DKIM signature?
            if (in_array(strtolower($header[&#039;label&#039;]), $autoSignHeaders, true)) {
                $headersToSignKeys[] = $header[&#039;label&#039;];
                $headersToSign[] = $header[&#039;label&#039;] . &#039;: &#039; . $header[&#039;value&#039;];
                if ($this-&gt;DKIM_copyHeaderFields) {
                    $copiedHeaders[] = $header[&#039;label&#039;] . &#039;:&#039; . //Note no space after this, as per RFC
                        str_replace(&#039;|&#039;, &#039;=7C&#039;, $this-&gt;DKIM_QP($header[&#039;value&#039;]));
                }
                continue;
            }
            //Is this an extra custom header we&#039;ve been asked to sign?
            if (in_array($header[&#039;label&#039;], $this-&gt;DKIM_extraHeaders, true)) {
                //Find its value in custom headers
                foreach ($this-&gt;CustomHeader as $customHeader) {
                    if ($customHeader[0] === $header[&#039;label&#039;]) {
                        $headersToSignKeys[] = $header[&#039;label&#039;];
                        $headersToSign[] = $header[&#039;label&#039;] . &#039;: &#039; . $header[&#039;value&#039;];
                        if ($this-&gt;DKIM_copyHeaderFields) {
                            $copiedHeaders[] = $header[&#039;label&#039;] . &#039;:&#039; . //Note no space after this, as per RFC
                                str_replace(&#039;|&#039;, &#039;=7C&#039;, $this-&gt;DKIM_QP($header[&#039;value&#039;]));
                        }
                        //Skip straight to the next header
                        continue 2;
                    }
                }
            }
        }
        $copiedHeaderFields = &#039;&#039;;
        if ($this-&gt;DKIM_copyHeaderFields &amp;&amp; count($copiedHeaders) &gt; 0) {
            //Assemble a DKIM &#039;z&#039; tag
            $copiedHeaderFields = &#039; z=&#039;;
            $first = true;
            foreach ($copiedHeaders as $copiedHeader) {
                if (!$first) {
                    $copiedHeaderFields .= static::$LE . &#039; |&#039;;
                }
                //Fold long values
                if (strlen($copiedHeader) &gt; self::STD_LINE_LENGTH - 3) {
                    $copiedHeaderFields .= substr(
                        chunk_split($copiedHeader, self::STD_LINE_LENGTH - 3, static::$LE . self::FWS),
                        0,
                        -strlen(static::$LE . self::FWS)
                    );
                } else {
                    $copiedHeaderFields .= $copiedHeader;
                }
                $first = false;
            }
            $copiedHeaderFields .= &#039;;&#039; . static::$LE;
        }
        $headerKeys = &#039; h=&#039; . implode(&#039;:&#039;, $headersToSignKeys) . &#039;;&#039; . static::$LE;
        $headerValues = implode(static::$LE, $headersToSign);
        $body = $this-&gt;DKIM_BodyC($body);
        //Base64 of packed binary SHA-256 hash of body
        $DKIMb64 = base64_encode(pack(&#039;H*&#039;, hash(&#039;sha256&#039;, $body)));
        $ident = &#039;&#039;;
        if (&#039;&#039; !== $this-&gt;DKIM_identity) {
            $ident = &#039; i=&#039; . $this-&gt;DKIM_identity . &#039;;&#039; . static::$LE;
        }
        //The DKIM-Signature header is included in the signature *except for* the value of the `b` tag
        //which is appended after calculating the signature
        //https://www.rfc-editor.org/rfc/rfc6376#section-3.5
        $dkimSignatureHeader = &#039;DKIM-Signature: v=1;&#039; .
            &#039; d=&#039; . $this-&gt;DKIM_domain . &#039;;&#039; .
            &#039; s=&#039; . $this-&gt;DKIM_selector . &#039;;&#039; . static::$LE .
            &#039; a=&#039; . $DKIMsignatureType . &#039;;&#039; .
            &#039; q=&#039; . $DKIMquery . &#039;;&#039; .
            &#039; t=&#039; . $DKIMtime . &#039;;&#039; .
            &#039; c=&#039; . $DKIMcanonicalization . &#039;;&#039; . static::$LE .
            $headerKeys .
            $ident .
            $copiedHeaderFields .
            &#039; bh=&#039; . $DKIMb64 . &#039;;&#039; . static::$LE .
            &#039; b=&#039;;
        //Canonicalize the set of headers
        $canonicalizedHeaders = $this-&gt;DKIM_HeaderC(
            $headerValues . static::$LE . $dkimSignatureHeader
        );
        $signature = $this-&gt;DKIM_Sign($canonicalizedHeaders);
        $signature = trim(chunk_split($signature, self::STD_LINE_LENGTH - 3, static::$LE . self::FWS));

        return static::normalizeBreaks($dkimSignatureHeader . $signature);
    }

    /**
     * Detect if a string contains a line longer than the maximum line length
     * allowed by RFC 2822 section 2.1.1.
     *
     * @param string $str
     *
     * @return bool
     */
    public static function hasLineLongerThanMax($str)
    {
        return (bool) preg_match(&#039;/^(.{&#039; . (self::MAX_LINE_LENGTH + strlen(static::$LE)) . &#039;,})/m&#039;, $str);
    }

    /**
     * If a string contains any &quot;special&quot; characters, double-quote the name,
     * and escape any double quotes with a backslash.
     *
     * @param string $str
     *
     * @return string
     *
     * @see RFC822 3.4.1
     */
    public static function quotedString($str)
    {
        if (preg_match(&#039;/[ ()&lt;&gt;@,;:&quot;\/\[\]?=]/&#039;, $str)) {
            //If the string contains any of these chars, it must be double-quoted
            //and any double quotes must be escaped with a backslash
            return &#039;&quot;&#039; . str_replace(&#039;&quot;&#039;, &#039;\\&quot;&#039;, $str) . &#039;&quot;&#039;;
        }

        //Return the string untouched, it doesn&#039;t need quoting
        return $str;
    }

    /**
     * Allows for public read access to &#039;to&#039; property.
     * Before the send() call, queued addresses (i.e. with IDN) are not yet included.
     *
     * @return array
     */
    public function getToAddresses()
    {
        return $this-&gt;to;
    }

    /**
     * Allows for public read access to &#039;cc&#039; property.
     * Before the send() call, queued addresses (i.e. with IDN) are not yet included.
     *
     * @return array
     */
    public function getCcAddresses()
    {
        return $this-&gt;cc;
    }

    /**
     * Allows for public read access to &#039;bcc&#039; property.
     * Before the send() call, queued addresses (i.e. with IDN) are not yet included.
     *
     * @return array
     */
    public function getBccAddresses()
    {
        return $this-&gt;bcc;
    }

    /**
     * Allows for public read access to &#039;ReplyTo&#039; property.
     * Before the send() call, queued addresses (i.e. with IDN) are not yet included.
     *
     * @return array
     */
    public function getReplyToAddresses()
    {
        return $this-&gt;ReplyTo;
    }

    /**
     * Allows for public read access to &#039;all_recipients&#039; property.
     * Before the send() call, queued addresses (i.e. with IDN) are not yet included.
     *
     * @return array
     */
    public function getAllRecipientAddresses()
    {
        return $this-&gt;all_recipients;
    }

    /**
     * Perform a callback.
     *
     * @param bool   $isSent
     * @param array  $to
     * @param array  $cc
     * @param array  $bcc
     * @param string $subject
     * @param string $body
     * @param string $from
     * @param array  $extra
     */
    protected function doCallback($isSent, $to, $cc, $bcc, $subject, $body, $from, $extra)
    {
        if (!empty($this-&gt;action_function) &amp;&amp; is_callable($this-&gt;action_function)) {
            call_user_func($this-&gt;action_function, $isSent, $to, $cc, $bcc, $subject, $body, $from, $extra);
        }
    }

    /**
     * Get the OAuthTokenProvider instance.
     *
     * @return OAuthTokenProvider
     */
    public function getOAuth()
    {
        return $this-&gt;oauth;
    }

    /**
     * Set an OAuthTokenProvider instance.
     */
    public function setOAuth(OAuthTokenProvider $oauth)
    {
        $this-&gt;oauth = $oauth;
    }
}
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