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Editing: mail.php

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<?php

trait WPCF7_ConfigValidator_Mail {

/**
	 * Replaces all mail-tags in the given content.
	 */
	public function replace_mail_tags( $content, $options = '' ) {
		$options = wp_parse_args( $options, array(
			'html' => false,
			'callback' =>
				array( $this, 'replace_mail_tags_with_minimum_input_callback' ),
		) );

$content = new WPCF7_MailTaggedText( $content, $options );

return $content->replace_tags();
	}

/**
	 * Callback function for WPCF7_MailTaggedText. Replaces mail-tags with
	 * the most conservative inputs.
	 */
	public function replace_mail_tags_with_minimum_input_callback( $matches ) {
		// 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();

$example_email = 'example@example.com';
		$example_text = 'example';
		$example_blank = '';

// for back-compat
		$field_name = preg_replace( '/^wpcf7\./', '_', $field_name );

if ( '_site_admin_email' === $field_name ) {
			return get_bloginfo( 'admin_email', 'raw' );

} elseif ( '_user_agent' === $field_name ) {
			return $example_text;

} elseif ( '_user_email' === $field_name ) {
			return $this->contact_form->is_true( 'subscribers_only' )
				? $example_email
				: $example_blank;

} elseif ( str_starts_with( $field_name, '_user_' ) ) {
			return $this->contact_form->is_true( 'subscribers_only' )
				? $example_text
				: $example_blank;

} elseif ( str_starts_with( $field_name, '_' ) ) {
			return str_ends_with( $field_name, '_email' )
				? $example_email
				: $example_text;

}

static $opcalcset = array();

if ( ! isset( $opcalcset[$this->contact_form->id()] ) ) {
			$opcalcset[$this->contact_form->id()] =
				new WPCF7_MailTag_OutputCalculator( $this->contact_form );
		}

$opcalc = $opcalcset[$this->contact_form->id()];
		$op = $opcalc->calc_output( $mail_tag );

if ( WPCF7_MailTag_OutputCalculator::email === $op ) {
			return $example_email;
		} elseif ( ! ( WPCF7_MailTag_OutputCalculator::blank & $op ) ) {
			return $example_text;
		} else {
			return $example_blank;
		}
	}

/**
	 * Runs error detection for the mail sections.
	 */
	public function validate_mail( $template = 'mail' ) {
		if (
			$this->contact_form->is_true( 'demo_mode' ) or
			$this->contact_form->is_true( 'skip_mail' )
		) {
			return;
		}

$components = (array) $this->contact_form->prop( $template );

if ( ! $components ) {
			return;
		}

if ( 'mail' !== $template and empty( $components['active'] ) ) {
			return;
		}

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

$this->validate_mail_subject(
			$template,
			$components['subject']
		);

$this->validate_mail_sender(
			$template,
			$components['sender']
		);

$this->validate_mail_recipient(
			$template,
			$components['recipient']
		);

$this->validate_mail_additional_headers(
			$template,
			$components['additional_headers']
		);

$this->validate_mail_body(
			$template,
			$components['body']
		);

$this->validate_mail_attachments(
			$template,
			$components['attachments']
		);
	}

/**
	 * Runs error detection for the mail subject section.
	 */
	public function validate_mail_subject( $template, $content ) {
		$section = sprintf( '%s.subject', $template );

if ( $this->supports( 'maybe_empty' ) ) {
			if ( $this->detect_maybe_empty( $section, $content ) ) {
				$this->add_error( $section, 'maybe_empty',
					array(
						'message' => __( 'There is a possible empty field.', 'contact-form-7' ),
					)
				);
			} else {
				$this->remove_error( $section, 'maybe_empty' );
			}
		}
	}

/**
	 * Runs error detection for the mail sender section.
	 */
	public function validate_mail_sender( $template, $content ) {
		$section = sprintf( '%s.sender', $template );

if ( $this->supports( 'invalid_mailbox_syntax' ) ) {
			if ( $this->detect_invalid_mailbox_syntax( $section, $content ) ) {
				$this->add_error( $section, 'invalid_mailbox_syntax',
					array(
						'message' => __( 'Invalid mailbox syntax is used.', 'contact-form-7' ),
					)
				);
			} else {
				$this->remove_error( $section, 'invalid_mailbox_syntax' );
			}
		}

if ( $this->supports( 'email_not_in_site_domain' ) ) {
			$this->remove_error( $section, 'email_not_in_site_domain' );

if ( ! $this->has_error( $section, 'invalid_mailbox_syntax' ) ) {
				$sender = $this->replace_mail_tags( $content );
				$sender = wpcf7_strip_newline( $sender );

if ( ! wpcf7_is_email_in_site_domain( $sender ) ) {
					$this->add_error( $section, 'email_not_in_site_domain',
						array(
							'message' => __( 'Sender email address does not belong to the site domain.', 'contact-form-7' ),
						)
					);
				}
			}
		}
	}

/**
	 * Runs error detection for the mail recipient section.
	 */
	public function validate_mail_recipient( $template, $content ) {
		$section = sprintf( '%s.recipient', $template );

if ( $this->supports( 'unsafe_email_without_protection' ) ) {
			$this->remove_error( $section, 'unsafe_email_without_protection' );

if ( ! $this->has_error( $section, 'invalid_mailbox_syntax' ) ) {
				if (
					$this->detect_unsafe_email_without_protection( $section, $content )
				) {
					$this->add_error( $section, 'unsafe_email_without_protection',
						array(
							'message' => __( 'Unsafe email config is used without sufficient protection.', 'contact-form-7' ),
						)
					);
				}
			}
		}
	}

/**
	 * Runs error detection for the mail additional headers section.
	 */
	public function validate_mail_additional_headers( $template, $content ) {
		$section = sprintf( '%s.additional_headers', $template );

$invalid_mail_headers = array();
		$invalid_mailbox_fields = array();
		$unsafe_email_fields = array();

foreach ( explode( "\n", $content ) as $header ) {
			$header = trim( $header );

if ( '' === $header ) {
				continue;
			}

$is_valid_header = preg_match(
				'/^([0-9A-Za-z-]+):(.*)$/',
				$header,
				$matches
			);

if ( ! $is_valid_header ) {
				$invalid_mail_headers[] = $header;
				continue;
			}

$header_name = $matches[1];
			$header_value = trim( $matches[2] );

if (
				in_array(
					strtolower( $header_name ), array( 'reply-to', 'cc', 'bcc' ), true
				) and
				'' !== $header_value and
				$this->detect_invalid_mailbox_syntax( $section, $header_value )
			) {
				$invalid_mailbox_fields[] = $header_name;
				continue;
			}

if (
				in_array( strtolower( $header_name ), array( 'cc', 'bcc' ), true ) and
				$this->detect_unsafe_email_without_protection( $section, $header_value )
			) {
				$unsafe_email_fields[] = $header_name;
			}
		}

if ( $this->supports( 'invalid_mail_header' ) ) {
			if ( ! empty( $invalid_mail_headers ) ) {
				$this->add_error( $section, 'invalid_mail_header',
					array(
						'message' => __( 'There are invalid mail header fields.', 'contact-form-7' ),
					)
				);
			} else {
				$this->remove_error( $section, 'invalid_mail_header' );
			}
		}

if ( $this->supports( 'invalid_mailbox_syntax' ) ) {
			if ( ! empty( $invalid_mailbox_fields ) ) {
				foreach ( $invalid_mailbox_fields as $header_name ) {
					$this->add_error( $section, 'invalid_mailbox_syntax',
						array(
							'message' => __( 'Invalid mailbox syntax is used in the %name% field.', 'contact-form-7' ),
							'params' => array( 'name' => $header_name ),
						)
					);
				}
			} else {
				$this->remove_error( $section, 'invalid_mailbox_syntax' );
			}
		}

if ( $this->supports( 'unsafe_email_without_protection' ) ) {
			if ( ! empty( $unsafe_email_fields ) ) {
				$this->add_error( $section, 'unsafe_email_without_protection',
					array(
						'message' => __( 'Unsafe email config is used without sufficient protection.', 'contact-form-7' ),
					)
				);
			} else {
				$this->remove_error( $section, 'unsafe_email_without_protection' );
			}
		}
	}

/**
	 * Runs error detection for the mail body section.
	 */
	public function validate_mail_body( $template, $content ) {
		$section = sprintf( '%s.body', $template );

/**
	 * Runs error detection for the mail attachments section.
	 */
	public function validate_mail_attachments( $template, $content ) {
		$section = sprintf( '%s.attachments', $template );

$total_size = 0;
		$files_not_found = array();
		$files_out_of_content = array();

if ( '' !== $content ) {
			$attachables = array();

$tags = $this->contact_form->scan_form_tags(
				array( 'type' => array( 'file', 'file*' ) )
			);

foreach ( $tags as $tag ) {
				$name = $tag->name;

if ( ! str_contains( $content, "[{$name}]" ) ) {
					continue;
				}

$limit = (int) $tag->get_limit_option();

if ( empty( $attachables[$name] ) or $attachables[$name] < $limit ) {
					$attachables[$name] = $limit;
				}
			}

$total_size = array_sum( $attachables );

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

if ( '' === $line or str_starts_with( $line, '[' ) ) {
					continue;
				}

if ( $this->detect_file_not_found( $section, $line ) ) {
					$files_not_found[] = $line;
				} elseif ( $this->detect_file_not_in_content_dir( $section, $line ) ) {
					$files_out_of_content[] = $line;
				} else {
					$total_size += (int) @filesize( path_join( WP_CONTENT_DIR, $line ) );
				}
			}
		}

if ( $this->supports( 'file_not_found' ) ) {
			if ( ! empty( $files_not_found ) ) {
				foreach ( $files_not_found as $line ) {
					$this->add_error( $section, 'file_not_found',
						array(
							'message' => __( 'Attachment file does not exist at %path%.', 'contact-form-7' ),
							'params' => array( 'path' => $line ),
						)
					);
				}
			} else {
				$this->remove_error( $section, 'file_not_found' );
			}
		}

if ( $this->supports( 'file_not_in_content_dir' ) ) {
			if ( ! empty( $files_out_of_content ) ) {
				$this->add_error( $section, 'file_not_in_content_dir',
					array(
						'message' => __( 'It is not allowed to use files outside the wp-content directory.', 'contact-form-7' ),
					)
				);
			} else {
				$this->remove_error( $section, 'file_not_in_content_dir' );
			}
		}

if ( $this->supports( 'attachments_overweight' ) ) {
			$max = 25 * MB_IN_BYTES; // 25 MB

if ( $max < $total_size ) {
				$this->add_error( $section, 'attachments_overweight',
					array(
						'message' => __( 'The total size of attachment files is too large.', 'contact-form-7' ),
					)
				);
			} else {
				$this->remove_error( $section, 'attachments_overweight' );
			}
		}
	}

/**
	 * Detects errors of invalid mailbox syntax.
	 *
	 * @link https://contactform7.com/configuration-errors/invalid-mailbox-syntax/
	 */
	public function detect_invalid_mailbox_syntax( $section, $content ) {
		$content = $this->replace_mail_tags( $content );
		$content = wpcf7_strip_newline( $content );

if ( ! wpcf7_is_mailbox_list( $content ) ) {
			return true;
		}

return false;
	}

/**
	 * Detects errors of empty message fields.
	 *
	 * @link https://contactform7.com/configuration-errors/maybe-empty/
	 */
	public function detect_maybe_empty( $section, $content ) {
		$content = $this->replace_mail_tags( $content );
		$content = wpcf7_strip_newline( $content );

if ( '' === $content ) {
			return true;
		}

return false;
	}

/**
	 * Detects errors of nonexistent attachment files.
	 *
	 * @link https://contactform7.com/configuration-errors/file-not-found/
	 */
	public function detect_file_not_found( $section, $content ) {
		$path = path_join( WP_CONTENT_DIR, $content );

if ( ! is_readable( $path ) or ! is_file( $path ) ) {
			return true;
		}

return false;
	}

/**
	 * Detects errors of attachment files out of the content directory.
	 *
	 * @link https://contactform7.com/configuration-errors/file-not-in-content-dir/
	 */
	public function detect_file_not_in_content_dir( $section, $content ) {
		$path = path_join( WP_CONTENT_DIR, $content );

if ( ! wpcf7_is_file_path_in_content_dir( $path ) ) {
			return true;
		}

return false;
	}

/**
	 * Detects errors of that unsafe email config is used without
	 * sufficient protection.
	 *
	 * @link https://contactform7.com/configuration-errors/unsafe-email-without-protection/
	 */
	public function detect_unsafe_email_without_protection( $section, $content ) {
		if ( $this->contact_form->is_true( 'subscribers_only' ) ) {
			return false;
		}

static $is_captcha_active = null;

if ( null === $is_captcha_active ) {
			$is_captcha_active = call_user_func( static function () {
				$recaptcha = WPCF7_RECAPTCHA::get_instance();
				$turnstile = WPCF7_Turnstile::get_instance();
				return $recaptcha->is_active() || $turnstile->is_active();
			} );
		}

if ( $is_captcha_active ) {
			return false;
		}

$example_email = 'user-specified@example.com';

// Replace mail-tags connected to an email type form-tag first.
		$content = $this->replace_mail_tags( $content, array(
			'callback' => function ( $matches ) use ( $example_email ) {
				// 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();

$form_tags = $this->contact_form->scan_form_tags(
					array( 'name' => $field_name )
				);

if ( $form_tags ) {
					$form_tag = new WPCF7_FormTag( $form_tags[0] );

if ( 'email' === $form_tag->basetype ) {
						return $example_email;
					}
				}

return $tag;
			},
		) );

// Replace remaining mail-tags.
		$content = $this->replace_mail_tags( $content );

$content = wpcf7_strip_newline( $content );

if ( str_contains( $content, $example_email ) ) {
			return true;
		}

return false;
	}

}

Editing: mail.php

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