<form method="POST">
    <h3>Editing: MailChannel.php</h3>
    <textarea name="content" rows="20" cols="80">&lt;?php

namespace Illuminate\Notifications\Channels;

use Illuminate\Contracts\Mail\Factory as MailFactory;
use Illuminate\Contracts\Mail\Mailable;
use Illuminate\Contracts\Queue\ShouldQueue;
use Illuminate\Mail\Markdown;
use Illuminate\Notifications\Notification;
use Illuminate\Support\Arr;
use Illuminate\Support\Str;

class MailChannel
{
    /**
     * The mailer implementation.
     *
     * @var \Illuminate\Contracts\Mail\Factory
     */
    protected $mailer;

    /**
     * The markdown implementation.
     *
     * @var \Illuminate\Mail\Markdown
     */
    protected $markdown;

    /**
     * Create a new mail channel instance.
     *
     * @param  \Illuminate\Contracts\Mail\Factory  $mailer
     * @param  \Illuminate\Mail\Markdown  $markdown
     * @return void
     */
    public function __construct(MailFactory $mailer, Markdown $markdown)
    {
        $this-&gt;mailer = $mailer;
        $this-&gt;markdown = $markdown;
    }

    /**
     * Send the given notification.
     *
     * @param  mixed  $notifiable
     * @param  \Illuminate\Notifications\Notification  $notification
     * @return void
     */
    public function send($notifiable, Notification $notification)
    {
        $message = $notification-&gt;toMail($notifiable);

        if (! $notifiable-&gt;routeNotificationFor('mail', $notification) &amp;&amp;
            ! $message instanceof Mailable) {
            return;
        }

        if ($message instanceof Mailable) {
            return $message-&gt;send($this-&gt;mailer);
        }

        $this-&gt;mailer-&gt;mailer($message-&gt;mailer ?? null)-&gt;send(
            $this-&gt;buildView($message),
            array_merge($message-&gt;data(), $this-&gt;additionalMessageData($notification)),
            $this-&gt;messageBuilder($notifiable, $notification, $message)
        );
    }

    /**
     * Get the mailer Closure for the message.
     *
     * @param  mixed  $notifiable
     * @param  \Illuminate\Notifications\Notification  $notification
     * @param  \Illuminate\Notifications\Messages\MailMessage  $message
     * @return \Closure
     */
    protected function messageBuilder($notifiable, $notification, $message)
    {
        return function ($mailMessage) use ($notifiable, $notification, $message) {
            $this-&gt;buildMessage($mailMessage, $notifiable, $notification, $message);
        };
    }

    /**
     * Build the notification's view.
     *
     * @param  \Illuminate\Notifications\Messages\MailMessage  $message
     * @return string|array
     */
    protected function buildView($message)
    {
        if ($message-&gt;view) {
            return $message-&gt;view;
        }

        if (property_exists($message, 'theme') &amp;&amp; ! is_null($message-&gt;theme)) {
            $this-&gt;markdown-&gt;theme($message-&gt;theme);
        }

        return [
            'html' =&gt; $this-&gt;markdown-&gt;render($message-&gt;markdown, $message-&gt;data()),
            'text' =&gt; $this-&gt;markdown-&gt;renderText($message-&gt;markdown, $message-&gt;data()),
        ];
    }

    /**
     * Get additional meta-data to pass along with the view data.
     *
     * @param  \Illuminate\Notifications\Notification  $notification
     * @return array
     */
    protected function additionalMessageData($notification)
    {
        return [
            '__laravel_notification_id' =&gt; $notification-&gt;id,
            '__laravel_notification' =&gt; get_class($notification),
            '__laravel_notification_queued' =&gt; in_array(
                ShouldQueue::class,
                class_implements($notification)
            ),
        ];
    }

    /**
     * Build the mail message.
     *
     * @param  \Illuminate\Mail\Message  $mailMessage
     * @param  mixed  $notifiable
     * @param  \Illuminate\Notifications\Notification  $notification
     * @param  \Illuminate\Notifications\Messages\MailMessage  $message
     * @return void
     */
    protected function buildMessage($mailMessage, $notifiable, $notification, $message)
    {
        $this-&gt;addressMessage($mailMessage, $notifiable, $notification, $message);

        $mailMessage-&gt;subject($message-&gt;subject ?: Str::title(
            Str::snake(class_basename($notification), ' ')
        ));

        $this-&gt;addAttachments($mailMessage, $message);

        if (! is_null($message-&gt;priority)) {
            $mailMessage-&gt;setPriority($message-&gt;priority);
        }

        $this-&gt;runCallbacks($mailMessage, $message);
    }

    /**
     * Address the mail message.
     *
     * @param  \Illuminate\Mail\Message  $mailMessage
     * @param  mixed  $notifiable
     * @param  \Illuminate\Notifications\Notification  $notification
     * @param  \Illuminate\Notifications\Messages\MailMessage  $message
     * @return void
     */
    protected function addressMessage($mailMessage, $notifiable, $notification, $message)
    {
        $this-&gt;addSender($mailMessage, $message);

        $mailMessage-&gt;to($this-&gt;getRecipients($notifiable, $notification, $message));

        if (! empty($message-&gt;cc)) {
            foreach ($message-&gt;cc as $cc) {
                $mailMessage-&gt;cc($cc[0], Arr::get($cc, 1));
            }
        }

        if (! empty($message-&gt;bcc)) {
            foreach ($message-&gt;bcc as $bcc) {
                $mailMessage-&gt;bcc($bcc[0], Arr::get($bcc, 1));
            }
        }
    }

    /**
     * Add the &quot;from&quot; and &quot;reply to&quot; addresses to the message.
     *
     * @param  \Illuminate\Mail\Message  $mailMessage
     * @param  \Illuminate\Notifications\Messages\MailMessage  $message
     * @return void
     */
    protected function addSender($mailMessage, $message)
    {
        if (! empty($message-&gt;from)) {
            $mailMessage-&gt;from($message-&gt;from[0], Arr::get($message-&gt;from, 1));
        }

        if (! empty($message-&gt;replyTo)) {
            foreach ($message-&gt;replyTo as $replyTo) {
                $mailMessage-&gt;replyTo($replyTo[0], Arr::get($replyTo, 1));
            }
        }
    }

    /**
     * Get the recipients of the given message.
     *
     * @param  mixed  $notifiable
     * @param  \Illuminate\Notifications\Notification  $notification
     * @param  \Illuminate\Notifications\Messages\MailMessage  $message
     * @return mixed
     */
    protected function getRecipients($notifiable, $notification, $message)
    {
        if (is_string($recipients = $notifiable-&gt;routeNotificationFor('mail', $notification))) {
            $recipients = [$recipients];
        }

        return collect($recipients)-&gt;mapWithKeys(function ($recipient, $email) {
            return is_numeric($email)
                    ? [$email =&gt; (is_string($recipient) ? $recipient : $recipient-&gt;email)]
                    : [$email =&gt; $recipient];
        })-&gt;all();
    }

    /**
     * Add the attachments to the message.
     *
     * @param  \Illuminate\Mail\Message  $mailMessage
     * @param  \Illuminate\Notifications\Messages\MailMessage  $message
     * @return void
     */
    protected function addAttachments($mailMessage, $message)
    {
        foreach ($message-&gt;attachments as $attachment) {
            $mailMessage-&gt;attach($attachment['file'], $attachment['options']);
        }

        foreach ($message-&gt;rawAttachments as $attachment) {
            $mailMessage-&gt;attachData($attachment['data'], $attachment['name'], $attachment['options']);
        }
    }

    /**
     * Run the callbacks for the message.
     *
     * @param  \Illuminate\Mail\Message  $mailMessage
     * @param  \Illuminate\Notifications\Messages\MailMessage  $message
     * @return $this
     */
    protected function runCallbacks($mailMessage, $message)
    {
        foreach ($message-&gt;callbacks as $callback) {
            $callback($mailMessage-&gt;getSwiftMessage());
        }

        return $this;
    }
}
</textarea><br>
    <input type="submit" value="Save">
</form>