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Editing: mail.php

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<?php

add_filter( 'wpcf7_mail_html_body', 'wpcf7_mail_html_body_autop', 10, 1 );

/**
 * Filter callback that applies auto-p to HTML email message body.
 */
function wpcf7_mail_html_body_autop( $body ) {
	if ( wpcf7_autop_or_not( array( 'for' => 'mail' ) ) ) {
		$body = wpcf7_autop( $body );
	}

return $body;
}

/**
 * Class that represents an attempt to compose and send email.
 */
class WPCF7_Mail {

private static $current = null;

private $name = '';
	private $locale = '';
	private $template = array();
	private $component = '';
	private $use_html = false;
	private $exclude_blank = false;

/**
	 * Returns the singleton instance of this class.
	 */
	public static function get_current() {
		return self::$current;
	}

/**
	 * Returns the name of the email template currently processed.
	 *
	 * Expected output: 'mail' or 'mail_2'
	 */
	public static function get_current_template_name() {
		$current = self::get_current();

if ( $current instanceof self ) {
			return $current->get_template_name();
		}
	}

/**
	 * Returns the name of the email template component currently processed.
	 *
	 * Expected output: 'recipient', 'sender', 'subject',
	 *                  'additional_headers', 'body', or 'attachments'
	 */
	public static function get_current_component_name() {
		$current = self::get_current();

if ( $current instanceof self ) {
			return $current->get_component_name();
		}
	}

/**
	 * Composes and sends email based on the specified template.
	 *
	 * @param array $template Array of email template.
	 * @param string $name Optional name of the template, such as
	 *               'mail' or 'mail_2'. Default empty string.
	 * @return bool Whether the email was sent successfully.
	 */
	public static function send( $template, $name = '' ) {
		self::$current = new self( $name, $template );
		return self::$current->compose();
	}

/**
	 * The constructor method.
	 *
	 * @param string $name The name of the email template.
	 *               Such as 'mail' or 'mail_2'.
	 * @param array $template Array of email template.
	 */
	private function __construct( $name, $template ) {
		$this->name = trim( $name );
		$this->use_html = ! empty( $template['use_html'] );
		$this->exclude_blank = ! empty( $template['exclude_blank'] );

$this->template = wp_parse_args( $template, array(
			'subject' => '',
			'sender' => '',
			'body' => '',
			'recipient' => '',
			'additional_headers' => '',
			'attachments' => '',
		) );

if ( $submission = WPCF7_Submission::get_instance() ) {
			$contact_form = $submission->get_contact_form();
			$this->locale = $contact_form->locale();
		}
	}

/**
	 * Returns the name of the email template.
	 */
	public function name() {
		return $this->name;
	}

/**
	 * Returns the name of the email template. A wrapper method of name().
	 */
	public function get_template_name() {
		return $this->name();
	}

/**
	 * Returns the name of the email template component currently processed.
	 */
	public function get_component_name() {
		return $this->component;
	}

/**
	 * Retrieves a component from the email template.
	 *
	 * @param string $component The name of the component.
	 * @param bool $replace_tags Whether to replace mail-tags
	 *             within the component.
	 * @return string The text representation of the email component.
	 */
	public function get( $component, $replace_tags = false ) {
		$this->component = $component;

$use_html = ( $this->use_html && 'body' === $component );
		$exclude_blank = ( $this->exclude_blank && 'body' === $component );

$component = $this->template[$component] ?? '';

if ( $replace_tags ) {
			$component = $this->replace_tags( $component, array(
				'html' => $use_html,
				'exclude_blank' => $exclude_blank,
			) );

if ( $use_html ) {
				// Convert <example@example.com> to &lt;example@example.com&gt;.
				$component = preg_replace_callback(
					'/<(.*?)>/',
					static function ( $matches ) {
						if ( is_email( $matches[1] ) ) {
							return sprintf( '&lt;%s&gt;', $matches[1] );
						} else {
							return $matches[0];
						}
					},
					$component
				);

if ( ! preg_match( '%<html[>\s].*</html>%is', $component ) ) {
					$component = $this->htmlize( $component );
				}
			}
		}

$this->component = '';

return $component;
	}

/**
	 * Creates HTML message body by adding the header and footer.
	 *
	 * @param string $body The body part of HTML.
	 * @return string Formatted HTML.
	 */
	private function htmlize( $body ) {
		if ( $this->locale ) {
			$lang_atts = sprintf( ' %s',
				wpcf7_format_atts( array(
					'dir' => wpcf7_is_rtl( $this->locale ) ? 'rtl' : 'ltr',
					'lang' => str_replace( '_', '-', $this->locale ),
				) )
			);
		} else {
			$lang_atts = '';
		}

$header = apply_filters( 'wpcf7_mail_html_header',
			'<!doctype html>
<html xmlns="http://www.w3.org/1999/xhtml"' . $lang_atts . '>
<head>
<title>' . esc_html( $this->get( 'subject', true ) ) . '</title>
</head>
<body>
',
			$this
		);

$body = apply_filters( 'wpcf7_mail_html_body', $body, $this );

$footer = apply_filters( 'wpcf7_mail_html_footer',
			'</body>
</html>',
			$this
		);

return $header . $body . $footer;
	}

/**
	 * Composes an email message and attempts to send it.
	 *
	 * @param bool $send Whether to attempt to send email. Default true.
	 */
	private function compose( $send = true ) {
		$components = array(
			'subject' => $this->get( 'subject', true ),
			'sender' => $this->get( 'sender', true ),
			'body' => $this->get( 'body', true ),
			'recipient' => $this->get( 'recipient', true ),
			'additional_headers' => $this->additional_headers(),
			'attachments' => $this->attachments(),
		);

$components = apply_filters( 'wpcf7_mail_components',
			$components, wpcf7_get_current_contact_form(), $this
		);

if ( ! $send ) {
			return $components;
		}

$subject = wpcf7_strip_newline( $components['subject'] );
		$sender = wpcf7_strip_newline( $components['sender'] );
		$recipient = wpcf7_strip_newline( $components['recipient'] );
		$additional_headers = $components['additional_headers'];
		$body = $components['body'];

$headers = array();

$headers[] = sprintf( 'From: %s', $sender );

if ( $this->use_html ) {
			$headers[] = 'Content-Type: text/html';
			$headers[] = 'X-WPCF7-Content-Type: text/html';
		} else {
			$headers[] = 'X-WPCF7-Content-Type: text/plain';
		}

$additional_headers = str_replace( "\r\n", "\n", $additional_headers );

foreach ( explode( "\n", $additional_headers ) as $additional_header ) {
			$headers[] = trim( $additional_header );
		}

$attachments = array_filter(
			(array) $components['attachments'],
			function ( $attachment ) {
				$path = path_join( WP_CONTENT_DIR, $attachment );

if ( ! wpcf7_is_file_path_in_content_dir( $path ) ) {
					wp_trigger_error(
						'',
						sprintf(
							/* translators: %s: Attachment file path. */
							__( 'Failed to attach a file. %s is not in the allowed directory.', 'contact-form-7' ),
							$path
						),
						E_USER_NOTICE
					);

return false;
				}

if ( ! is_readable( $path ) or ! is_file( $path ) ) {
					wp_trigger_error(
						'',
						sprintf(
							/* translators: %s: Attachment file path. */
							__( 'Failed to attach a file. %s is not a readable file.', 'contact-form-7' ),
							$path
						),
						E_USER_NOTICE
					);

return false;
				}

static $total_size = array();

if ( ! isset( $total_size[$this->name] ) ) {
					$total_size[$this->name] = 0;
				}

$file_size = (int) @filesize( $path );

if ( 25 * MB_IN_BYTES < $total_size[$this->name] + $file_size ) {
					wp_trigger_error(
						'',
						__( 'Failed to attach a file. The total file size exceeds the limit of 25 megabytes.', 'contact-form-7' ),
						E_USER_NOTICE
					);

return false;
				}

$total_size[$this->name] += $file_size;

return true;
			}
		);

return wp_mail( $recipient, $subject, $body, $headers, $attachments );
	}

/**
	 * Replaces mail-tags within the given text.
	 */
	public function replace_tags( $content, $options = '' ) {
		if ( true === $options ) {
			$options = array( 'html' => true );
		}

$options = wp_parse_args( $options, array(
			'html' => false,
			'exclude_blank' => false,
		) );

return wpcf7_mail_replace_tags( $content, $options );
	}

/**
	 * Retrieves additional headers from the template.
	 */
	private function additional_headers( $template = null ) {
		if ( ! $template ) {
			$template = $this->get( 'additional_headers' );
		}

$headers = array();

foreach ( explode( "\n", $template ) as $line ) {
			if ( ! str_contains( $line, ':' ) ) {
				continue;
			}

$line = $this->replace_tags( $line );
			$line = str_replace( "\r\n", "\n", $line );

list( $header ) = explode( "\n", $line, 2 );

$headers[] = $header;
		}

return implode( "\n", $headers );
	}

/**
	 * Creates an array of attachments based on uploaded files and local files.
	 */
	private function attachments( $template = null ) {
		if ( ! $template ) {
			$template = $this->get( 'attachments' );
		}

$attachments = array();

if ( $submission = WPCF7_Submission::get_instance() ) {
			$uploaded_files = $submission->uploaded_files();

foreach ( (array) $uploaded_files as $name => $paths ) {
				if ( false !== strpos( $template, "[{$name}]" ) ) {
					$attachments = array_merge( $attachments, (array) $paths );
				}
			}
		}

foreach ( explode( "\n", $template ) as $line ) {
			$line = trim( $line );

if ( '' === $line or '[' === substr( $line, 0, 1 ) ) {
				continue;
			}

$attachments[] = path_join( WP_CONTENT_DIR, $line );
		}

if ( $submission = WPCF7_Submission::get_instance() ) {
			$attachments = array_merge(
				$attachments,
				(array) $submission->extra_attachments( $this->name )
			);
		}

return $attachments;
	}
}

/**
 * Replaces all mail-tags within the given text content.
 *
 * @param string $content Text including mail-tags.
 * @param string|array $options Optional. Output options.
 * @return string Result of replacement.
 */
function wpcf7_mail_replace_tags( $content, $options = '' ) {
	$options = wp_parse_args( $options, array(
		'html' => false,
		'exclude_blank' => false,
	) );

if ( is_array( $content ) ) {
		foreach ( $content as $key => $value ) {
			$content[$key] = wpcf7_mail_replace_tags( $value, $options );
		}

return $content;
	}

$content = explode( "\n", $content );

foreach ( $content as $num => $line ) {
		$line = new WPCF7_MailTaggedText( $line, $options );
		$replaced = $line->replace_tags();

if ( $options['exclude_blank'] ) {
			$replaced_tags = $line->get_replaced_tags();

if (
				empty( $replaced_tags ) or
				array_filter( $replaced_tags, 'strlen' )
			) {
				$content[$num] = $replaced;
			} else {
				unset( $content[$num] ); // Remove a line.
			}
		} else {
			$content[$num] = $replaced;
		}
	}

$content = implode( "\n", $content );

return $content;
}

add_action( 'phpmailer_init', 'wpcf7_phpmailer_init', 10, 1 );

/**
 * Adds custom properties to the PHPMailer object.
 */
function wpcf7_phpmailer_init( $phpmailer ) {
	$custom_headers = $phpmailer->getCustomHeaders();
	$phpmailer->clearCustomHeaders();
	$wpcf7_content_type = false;

foreach ( (array) $custom_headers as $custom_header ) {
		$name = $custom_header[0];
		$value = $custom_header[1];

if ( 'X-WPCF7-Content-Type' === $name ) {
			$wpcf7_content_type = trim( $value );
		} else {
			$phpmailer->addCustomHeader( $name, $value );
		}
	}

if ( 'text/html' === $wpcf7_content_type ) {
		$phpmailer->msgHTML( $phpmailer->Body );
	} elseif ( 'text/plain' === $wpcf7_content_type ) {
		$phpmailer->AltBody = '';
	}
}

/**
 * Class that represents a single-line text including mail-tags.
 */
class WPCF7_MailTaggedText {

private $html = false;
	private $callback = null;
	private $content = '';
	private $replaced_tags = array();

/**
	 * The constructor method.
	 */
	public function __construct( $content, $options = '' ) {
		$options = wp_parse_args( $options, array(
			'html' => false,
			'callback' => null,
		) );

$this->html = (bool) $options['html'];

if (
			null !== $options['callback'] and
			is_callable( $options['callback'] )
		) {
			$this->callback = $options['callback'];
		} elseif ( $this->html ) {
			$this->callback = array( $this, 'replace_tags_callback_html' );
		} else {
			$this->callback = array( $this, 'replace_tags_callback' );
		}

$this->content = $content;
	}

/**
	 * Retrieves mail-tags that have been replaced by this instance.
	 *
	 * @return array List of mail-tags replaced.
	 */
	public function get_replaced_tags() {
		return $this->replaced_tags;
	}

/**
	 * Replaces mail-tags based on regexp.
	 */
	public function replace_tags() {
		$regex = '/(\[?)\[[\t ]*'
			. '([a-zA-Z_][0-9a-zA-Z:._-]*)' // [2] = name
			. '((?:[\t ]+"[^"]*"|[\t ]+\'[^\']*\')*)' // [3] = values
			. '[\t ]*\](\]?)/';

return preg_replace_callback( $regex, $this->callback, $this->content );
	}

/**
	 * Callback function for replacement. For HTML message body.
	 */
	private function replace_tags_callback_html( $matches ) {
		return $this->replace_tags_callback( $matches, true );
	}

/**
	 * Callback function for replacement.
	 */
	private function replace_tags_callback( $matches, $html = false ) {
		// allow [[foo]] syntax for escaping a tag
		if ( '[' === $matches[1] and ']' === $matches[4] ) {
			return substr( $matches[0], 1, -1 );
		}

$tag = $matches[0];
		$tagname = $matches[2];
		$values = $matches[3];

$mail_tag = new WPCF7_MailTag( $tag, $tagname, $values );
		$field_name = $mail_tag->field_name();

$submission = WPCF7_Submission::get_instance();
		$submitted = $submission
			? $submission->get_posted_data( $field_name )
			: null;

if ( $mail_tag->get_option( 'do_not_heat' ) ) {
			$submitted = wpcf7_superglobal_post( $field_name );
		}

$replaced = $submitted;

if ( null !== $replaced ) {
			if ( $format = $mail_tag->get_option( 'format' ) ) {
				$replaced = $this->format( $replaced, $format );
			}

$separator = ( 'body' === WPCF7_Mail::get_current_component_name() )
				? wp_get_list_item_separator()
				: ', ';

$replaced = wpcf7_flat_join( $replaced, array(
				'separator' => $separator,
			) );

if ( $html ) {
				$replaced = esc_html( $replaced );
				$replaced = wptexturize( $replaced );
			}
		}

if ( $form_tag = $mail_tag->corresponding_form_tag() ) {
			$type = $form_tag->type;

$replaced = apply_filters(
				"wpcf7_mail_tag_replaced_{$type}", $replaced,
				$submitted, $html, $mail_tag
			);
		}

$replaced = apply_filters(
			'wpcf7_mail_tag_replaced', $replaced,
			$submitted, $html, $mail_tag
		);

if ( null !== $replaced ) {
			$replaced = trim( $replaced );

$this->replaced_tags[$tag] = $replaced;
			return $replaced;
		}

$special = apply_filters( 'wpcf7_special_mail_tags', null,
			$mail_tag->tag_name(), $html, $mail_tag
		);

if ( null !== $special ) {
			$this->replaced_tags[$tag] = $special;
			return $special;
		}

return $tag;
	}

/**
	 * Formats string based on the formatting option in the form-tag.
	 */
	public function format( $original, $format ) {
		$original = (array) $original;

foreach ( $original as $key => $value ) {
			if ( preg_match( '/^[0-9]{4}-[0-9]{2}-[0-9]{2}$/', $value ) ) {
				$datetime = date_create( $value, wp_timezone() );

if ( false !== $datetime ) {
					$original[$key] = wp_date( $format, $datetime->getTimestamp() );
				}
			}
		}

return $original;
	}

}

Editing: mail.php

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