Laravel - Mail - Events

Laravel fires two events during the process of sending mail messages. The MessageSending event is fired prior to a message being sent, while the MessageSent event is fired after a message has been sent. Remember, these events are fired when the mail is being sent, not when it is queued. You may register event listeners for this event in your App\Providers\EventServiceProvider service provider:

     * The event listener mappings for the application.
     * @var array
    protected $listen = [
        'Illuminate\Mail\Events\MessageSending' => [
        'Illuminate\Mail\Events\MessageSent' => [