Laravel - Notifications - Customizing The Mailer

By default, the email notification will be sent using the default mailer defined in the config/mail.php configuration file. However, you may specify a different mailer at runtime by calling the mailer method when building your message:

    
    /**
     * Get the mail representation of the notification.
     *
     * @param  mixed  $notifiable
     * @return \Illuminate\Notifications\Messages\MailMessage
     */
    public function toMail($notifiable)
    {
        return (new MailMessage)
                    ->mailer('postmark')
                    ->line('...');
    }