clrghouz/app/Mail/TestEmail.php

<?php

namespace App\Mail;

use Illuminate\Bus\Queueable;
use Illuminate\Contracts\Queue\ShouldQueue;
use Illuminate\Mail\Mailable;
use Illuminate\Queue\SerializesModels;

use App\Classes\Protocol;
use App\Models\{Setup,User};

class TestEmail extends Mailable
{
	use Queueable, SerializesModels;

	/* User to send mail to */
	public User $user;
	/* Our setup object */
	public Setup $setup;

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

	/**
	 * Build the message.
	 *
	 * @return $this
	 */
	public function build()
	{
		$this->setup = Setup::findOrFail(config('app.id'));

		return $this
			->markdown('mail.system.test_email')
			->subject('Just a test...')
			->with([
				'url'=>sprintf('https://%s',gethostname()),
			]);
	}
}