Eventos da Laravel não fazem enviou de E-mails

Olá pessoal, estou trabalhando com Laravel e não consigo fazer com que meu Evento de disparar um email para o usuário seja efetuado. Segue os códigos abaixo:

• Controller:

<?php

namespace pedidos\Http\Controllers;

use Event;

use pedidos\User;

use Illuminate\Http\Request;

use pedidos\Http\Requests;

use pedidos\Events\App\Events\PostUserRegister;

class UsersController extends Controller {

 public function mail()
	{
 $user = User::find(1);
 return Event::fire(new PostUserRegister($user));
	}
}

• Event PostUserRegister

<?php

namespace pedidos\Events\App\Events;

use Event;
use pedidos\User;
use Illuminate\Broadcasting\Channel;
use Illuminate\Queue\SerializesModels;
use Illuminate\Broadcasting\PrivateChannel;
use Illuminate\Broadcasting\PresenceChannel;
use Illuminate\Broadcasting\InteractsWithSockets;
use Illuminate\Contracts\Broadcasting\ShouldBroadcast;

class PostUserRegister extends Event
{

 use InteractsWithSockets, SerializesModels;

 /**
 * Create a new event instance.
 *
 * @return void
 */
 private $user;

 public function __construct(User $user)
 {
 $this->user = $user;
 }

 public function get_user()
 {
 return $this->user;
 }

 /**
 * Get the channels the event should broadcast on.
 *
 * @return Channel|array
 */
 public function broadcastOn()
 {
 return new PrivateChannel('channel-name');
 }
}

-Listeners SendWelcomeEmail

<?php

namespace pedidos\Listeners\App\Listeners;

use Mail;
use pedidos\Events\App\Events\PostUserRegister;
use Illuminate\Queue\InteractsWithQueue;
use Illuminate\Contracts\Queue\ShouldQueue;

class SendWelcomeEmail
{
/**
* Create the event listener.
*

 * @return void
 */
 public function __construct()
 {
 //
 }

 /**
 * Handle the event.
 *
 * @param PostUserRegister $event
 * @return void
 */
 public function handle(PostUserRegister $event)
 {
 $user = $event->get_user();
 Mail::send('errors.503', ['user' => $user], function ($m) use ($user) {
 $m->to($user->email, $user->name)->subject('Welcome my Friend!');
 });
 }
}

Ele apenas retorna "[]".

O que pode estar acontecendo???