Edit file File name : OptimizedEmailSending.php Content :<?php namespace WPMailSMTP; /** * OptimizedEmailSending class. * * @since 4.0.0 */ class OptimizedEmailSending { /** * The slug of the option that toggles optimized email sending. * * @since 4.0.0 */ const SETTINGS_SLUG = 'optimize_email_sending_enabled'; /** * Register hooks. * * @since 4.0.0 */ public function hooks() { // Avoid enqueueing emails if current request // is a cron request, a CLI request, // or an ActionScheduler task as 3rd party plugins might // be carrying out their own sending optimizations // through it. if ( self::is_enabled() && ! ( defined( 'WP_CLI' ) && WP_CLI ) && ! wp_doing_cron() && ! doing_action( 'action_scheduler_run_queue' ) ) { // Enable the queue. add_filter( 'wp_mail_smtp_queue_is_enabled', '__return_true' ); // Start enqueueing emails. add_filter( 'wp_mail_smtp_mail_catcher_send_enqueue_email', '__return_true' ); } } /** * Whether optimized email sending is enabled. * * @since 4.0.0 * * @return bool */ public static function is_enabled() { $value = Options::init()->get( 'general', self::SETTINGS_SLUG ); return (bool) $value; } } Save