liwo/app/Notifications/MailNotification.php

<?php

namespace App\Notifications;

use Illuminate\Bus\Queueable;
use Illuminate\Contracts\Queue\ShouldQueue;
use Illuminate\Notifications\Messages\MailMessage;
use Illuminate\Notifications\Notification;

class MailNotification extends Notification //implements ShouldQueue
{
    use Queueable;

    public $message;

    /**
     * The name of the queue connection to use when queueing the notification.
     *
     * @var string
     */
//    public $connection = 'redis';

    /**
     * If your queue connection's after_commit configuration option is set to true,
     * indicate that a particular queued listener should be dispatched after all database transactions closed
     *
     * @var boolean
     */
//    public $afterCommit = true;

    /**
     * Determine which queues should be used for  notification.
     *
     * @return string
     */
//    public $queue = 'mail-queue';



    /**
     * Create a new notification instance.
     *
     * @return void
     */
    public function __construct($message)
    {
        $this->message = $message;
    }

    /**
     * Get the notification's delivery channels.
     *
     * @param  mixed  $notifiable
     * @return array
     */
    public function via($notifiable)
    {
        return ['mail'];
    }

    /**
     * Get the mail representation of the notification.
     *
     * @param  mixed  $notifiable
     * @return \Illuminate\Notifications\Messages\MailMessage
     */
    public function toMail($notifiable)
    {
        return (new MailMessage)
                    ->line(__('notification.'.$this->message))
                    ->action('Notification Action', url('/'))
                    ->line('Thank you for using our application!');
    }

    /**
     * Get the array representation of the notification.
     *
     * @param  mixed  $notifiable
     * @return array
     */
    public function toArray($notifiable)
    {
        return [
            //
        ];
    }
}