SMTP: Change Message-ID domain in sending emails from Laravel 5.7 (Swift Mailer)

Question

Laravel 5.7 sends emails using Swift Mailer.

By default, all sent emails will have the Message-ID header with the domain swift.generated (eg. Message-ID: <90b9835f38bb441bea134d3ac815dd6f@swift.generated>).

I would like to change the domain swift.generated to for example my-domain.com.

How can I change this for all emails?

Answer 1

1. Edit the file config/mail.php and define your domain near the end:

    'domain' => 'yourdomain.com',

2. In the command line, create a new listener:

    php artisan make:listener -e 'Illuminate\Mail\Events\MessageSending' MessageSendingListener

3. Edit the newly created listener and make it look as follows (do NOT implement ShouldQueue):

    <?php
    /**
     * Set the domain part in the message-id generated by Swift Mailer
     */

    namespace App\Listeners;

    use Illuminate\Mail\Events\MessageSending;
    use Swift_Mime_IdGenerator;

    class MessageSendingListener
    {
        /**
         * Create the event listener.
         *
         * @return void
         */
        public function __construct()
        {
            //
        }

        /**
         * Handle the event.
         *
         * @param  MessageSending  $event
         * @return void
         */
        public function handle(MessageSending $event)
        {
            $event->message->setId((new Swift_Mime_IdGenerator(config('mail.domain')))->generateId());
        }
    }

4. Register the listener in app/Providers/EventServiceProvider:

        protected $listen = [

           // [...]

            \Illuminate\Mail\Events\MessageSending::class => [
                 \App\Listeners\MessageSendingListener::class,
            ],
         ];

That's it, enjoy! :)