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Editing: wp_mail_smtp.php

<?php
/**
 * Plugin Name: WP Mail SMTP
 * Version: 4.7.1
 * Requires at least: 5.5
 * Requires PHP: 7.4
 * Plugin URI: https://wpmailsmtp.com/
 * Description: Send WordPress emails reliably via SMTP or API using SendLayer, Brevo, SMTP.com, Gmail, Outlook, or another email service of your choice.
 * Author: WP Mail SMTP
 * Author URI: https://wpmailsmtp.com/
 * Network: false
 * Text Domain: wp-mail-smtp
 * Domain Path: /assets/languages
 */

/**
 * @author    WPForms
 * @copyright WPForms, 2007-23, All Rights Reserved
 * This code is released under the GPL licence version 3 or later, available here
 * https://www.gnu.org/licenses/gpl.txt
 */

/**
 * Setting options in wp-config.php
 *
 * Specifically aimed at WP Multisite users, you can set the options for this plugin as
 * constants in wp-config.php. Copy the code below into wp-config.php and tweak settings.
 * Values from constants are NOT stripslash()'ed.
 *
 * When enabled, make sure to comment out (at the beginning of the line using //) those constants that you do not need,
 * or remove them completely, so they won't interfere with plugin settings.
 */

/*
define( 'WPMS_ON', true ); // True turns on the whole constants support and usage, false turns it off.

define( 'WPMS_DO_NOT_SEND', true ); // Or false, in that case constant is ignored.

define( 'WPMS_MAIL_FROM', 'mail@example.com' );
define( 'WPMS_MAIL_FROM_FORCE', true ); // True turns it on, false turns it off.
define( 'WPMS_MAIL_FROM_NAME', 'From Name' );
define( 'WPMS_MAIL_FROM_NAME_FORCE', true ); // True turns it on, false turns it off.
define( 'WPMS_MAILER', 'sendinblue' ); // Possible values: 'mail', 'smtpcom', 'sendinblue', 'mailgun', 'sendgrid', 'gmail', 'smtp'.
define( 'WPMS_SET_RETURN_PATH', true ); // Sets $phpmailer->Sender if true, relevant only for Other SMTP mailer.

// Recommended mailers.
define( 'WPMS_SMTPCOM_API_KEY', '' );
define( 'WPMS_SMTPCOM_CHANNEL', '' );
define( 'WPMS_SENDINBLUE_API_KEY', '' );
define( 'WPMS_SENDINBLUE_DOMAIN', '' );

define( 'WPMS_ZOHO_DOMAIN', '' );
define( 'WPMS_ZOHO_CLIENT_ID', '' );
define( 'WPMS_ZOHO_CLIENT_SECRET', '' );

define( 'WPMS_PEPIPOST_API_KEY', '' );

define( 'WPMS_SENDINBLUE_API_KEY', '' );

define( 'WPMS_MAILGUN_API_KEY', '' );
define( 'WPMS_MAILGUN_DOMAIN', '' );
define( 'WPMS_MAILGUN_REGION', 'US' ); // or 'EU' for Europe.

define( 'WPMS_SENDGRID_API_KEY', '' );

define( 'WPMS_GMAIL_CLIENT_ID', '' );
define( 'WPMS_GMAIL_CLIENT_SECRET', '' );

define( 'WPMS_SMTP_HOST', 'localhost' ); // The SMTP mail host.
define( 'WPMS_SMTP_PORT', 25 ); // The SMTP server port number.
define( 'WPMS_SSL', '' ); // Possible values '', 'ssl', 'tls' - note TLS is not STARTTLS.
define( 'WPMS_SMTP_AUTH', true ); // True turns it on, false turns it off.
define( 'WPMS_SMTP_USER', 'username' ); // SMTP authentication username, only used if WPMS_SMTP_AUTH is true.
define( 'WPMS_SMTP_PASS', 'password' ); // SMTP authentication password, only used if WPMS_SMTP_AUTH is true.
define( 'WPMS_SMTP_AUTOTLS', true ); // True turns it on, false turns it off.
*/

/**
 * Don't allow multiple versions of 1.5.x (Lite and Pro) and above to be active.
 *
 * @since 1.5.0
 */
if ( function_exists( 'wp_mail_smtp' ) ) {

if ( ! function_exists( 'wp_mail_smtp_deactivate' ) ) {
		/**
		 * Deactivate if plugin already activated.
		 * Needed when transitioning from 1.5+ Lite to Pro.
		 *
		 * @since 1.5.0
		 */
		function wp_mail_smtp_deactivate() {
			/*
			 * Prevent issues of WP functions not being available for other plugins that hook into
			 * this early deactivation. GH issue #861.
			 */
			require_once ABSPATH . WPINC . '/pluggable.php';

deactivate_plugins( plugin_basename( __FILE__ ) );
		}
	}
	add_action( 'admin_init', 'wp_mail_smtp_deactivate' );

// Do not process the plugin code further.
	return;
}

if ( ! function_exists( 'wp_mail_smtp_check_pro_loading_allowed' ) ) {
	/**
	 * Don't allow 1.4.x and below to break when 1.5+ Pro is activated.
	 * This will stop the current plugin from loading and display a message in admin area.
	 *
	 * @since 1.5.0
	 */
	function wp_mail_smtp_check_pro_loading_allowed() {

// Check for pro without using wp_mail_smtp()->is_pro(), because at this point it's too early.
		if ( ! is_readable( rtrim( plugin_dir_path( __FILE__ ), '/\\' ) . '/src/Pro/Pro.php' ) ) {
			// Currently, not a pro version of the plugin is loaded.
			return false;
		}

if ( ! function_exists( 'is_plugin_active' ) ) {
			require_once ABSPATH . '/wp-admin/includes/plugin.php';
		}

$lite_plugin_slug = 'wp-mail-smtp/wp_mail_smtp.php';

// Search for old plugin name.
		if ( is_plugin_active( $lite_plugin_slug ) ) {
			/*
			 * Prevent issues of WP functions not being available for other plugins that hook into
			 * this early deactivation. GH issue #861.
			 */
			require_once ABSPATH . WPINC . '/pluggable.php';

if (
				is_multisite() &&
				is_plugin_active_for_network( plugin_basename( __FILE__ ) ) &&
				! is_plugin_active_for_network( $lite_plugin_slug )
			) {
				// Deactivate Lite plugin if Pro activated on Network level.
				deactivate_plugins( $lite_plugin_slug );
			} else {
				// As Pro is loaded and Lite too - deactivate *silently* itself not to break older SMTP plugin.
				deactivate_plugins( plugin_basename( __FILE__ ) );

if ( is_network_admin() ) {
					add_action( 'network_admin_notices', 'wp_mail_smtp_lite_deactivation_notice' );
				} else {
					add_action( 'admin_notices', 'wp_mail_smtp_lite_deactivation_notice' );
				}

return true;
			}
		}

return false;
	}

if ( ! function_exists( 'wp_mail_smtp_lite_deactivation_notice' ) ) {
		/**
		 * Display the notice after deactivation.
		 *
		 * @since 1.5.0
		 */
		function wp_mail_smtp_lite_deactivation_notice() {

echo '<div class="notice notice-warning"><p>' . esc_html__( 'Please deactivate the free version of the WP Mail SMTP plugin before activating WP Mail SMTP Pro.', 'wp-mail-smtp' ) . '</p></div>';

if ( isset( $_GET['activate'] ) ) { // phpcs:ignore WordPress.Security.NonceVerification.Recommended
				unset( $_GET['activate'] ); // phpcs:ignore WordPress.Security.NonceVerification.Recommended
			}
		}
	}

// Stop the plugin loading.
	if ( wp_mail_smtp_check_pro_loading_allowed() === true ) {
		return;
	}
}

if ( ! function_exists( 'wp_mail_smtp_insecure_php_version_notice' ) ) {
	/**
	 * Display admin notice, if the server is using old/insecure PHP version.
	 *
	 * @since 2.0.0
	 */
	function wp_mail_smtp_insecure_php_version_notice() {

?>
		<div class="notice notice-error">
			<p>
				<?php
				printf(
					wp_kses( /* translators: %1$s - WPBeginner URL for recommended WordPress hosting. */
						__( 'Your site is running an <strong>insecure version</strong> of PHP that is no longer supported. Please contact your web hosting provider to update your PHP version or switch to a <a href="%1$s" target="_blank" rel="noopener noreferrer">recommended WordPress hosting company</a>.', 'wp-mail-smtp' ),
						array(
							'a'      => array(
								'href'   => array(),
								'target' => array(),
								'rel'    => array(),
							),
							'strong' => array(),
						)
					),
					'https://www.wpbeginner.com/wordpress-hosting/'
				);
				?>
				<br><br>
				<?php

$doc_link = add_query_arg(
					[
						'utm_source'   => 'WordPress',
						'utm_medium'   => 'Admin Notice',
						'utm_campaign' => is_readable( rtrim( plugin_dir_path( __FILE__ ), '/\\' ) . '/src/Pro/Pro.php' ) ? 'plugin' : 'liteplugin',
						'utm_content'  => 'Minimal Required PHP Version',
					],
					'https://wpmailsmtp.com/docs/supported-php-versions-for-wp-mail-smtp/'
				);

printf(
					wp_kses( /* translators: %s - WPMailSMTP.com docs URL with more details. */
						__( '<strong>WP Mail SMTP plugin is disabled</strong> on your site until you fix the issue. <a href="%s" target="_blank" rel="noopener noreferrer">Read more for additional information.</a>', 'wp-mail-smtp' ),
						array(
							'a'      => array(
								'href'   => array(),
								'target' => array(),
								'rel'    => array(),
							),
							'strong' => array(),
						)
					),
					esc_url( $doc_link )
				);
				?>
			</p>
		</div>

<?php

// In case this is on plugin activation.
		if ( isset( $_GET['activate'] ) ) { //phpcs:ignore
			unset( $_GET['activate'] ); //phpcs:ignore
		}
	}
}

if ( ! defined( 'WPMS_PLUGIN_VER' ) ) {
	/**
	 * Plugin version.
	 *
	 * @since 0.11.1
	 */
	define( 'WPMS_PLUGIN_VER', '4.7.1' );
}
if ( ! defined( 'WPMS_PHP_VER' ) ) {
	/**
	 * Minimum supported PHP version.
	 *
	 * @since 1.0.0
	 */
	define( 'WPMS_PHP_VER', '7.4' );
}
if ( ! defined( 'WPMS_WP_VER' ) ) {
	/**
	 * Minimum supported WordPress version.
	 *
	 * @since 3.3.0
	 */
	define( 'WPMS_WP_VER', '5.5' );
}
if ( ! defined( 'WPMS_PLUGIN_FILE' ) ) {
	/**
	 * Plugin main file path.
	 *
	 * @since 2.1.2
	 */
	define( 'WPMS_PLUGIN_FILE', __FILE__ );
}

if ( ! function_exists( 'wp_mail_smtp_unsupported_wp_version_notice' ) ) {
	/**
	 * Display admin notice, if the site is using unsupported WP version.
	 *
	 * @since 3.3.0
	 */
	function wp_mail_smtp_unsupported_wp_version_notice() {

?>
		<div class="notice notice-error">
			<p>
				<?php
				printf(
					wp_kses( /* translators: %s The minimal WP version supported by WP Mail SMTP. */
						__( 'Your site is running an <strong>old version</strong> of WordPress that is no longer supported by WP Mail SMTP. Please update your WordPress site to at least version <strong>%s</strong>.', 'wp-mail-smtp' ),
						[
							'strong' => [],
						]
					),
					esc_html( WPMS_WP_VER )
				);
				?>
				<br><br>
				<?php
				echo wp_kses(
					__( '<strong>WP Mail SMTP plugin is disabled</strong> on your site until WordPress is updated to the required version.', 'wp-mail-smtp' ),
					[
						'strong' => [],
					]
				);
				?>
			</p>
		</div>

<?php

// In case this is on plugin activation.
		if ( isset( $_GET['activate'] ) ) { //phpcs:ignore
			unset( $_GET['activate'] ); //phpcs:ignore
		}
	}
}

/**
 * Display admin notice and prevent plugin code execution, if the server is
 * using old/insecure PHP version.
 *
 * @since 2.0.0
 */
if ( version_compare( phpversion(), WPMS_PHP_VER, '<' ) ) {
	add_action( 'admin_notices', 'wp_mail_smtp_insecure_php_version_notice' );

return;
}

/**
 * Display admin notice and prevent plugin code execution, if the WP version is lower than WPMS_WP_VER.
 *
 * @since 3.3.0
 */
if ( version_compare( get_bloginfo( 'version' ), WPMS_WP_VER, '<' ) ) {
	add_action( 'admin_notices', 'wp_mail_smtp_unsupported_wp_version_notice' );

return;
}

require_once dirname( __FILE__ ) . '/wp-mail-smtp.php';