fipamo/app/Http/Controllers/SystemMailController.php

<?php

namespace App\Http\Controllers;

use Illuminate\Support\Facades\Mail;

class SystemMailController extends Controller
{
    /**
     * Send notification
     */
    public function sendNotification()
    {
        $message = "This is something important. Probably";
        Mail::to(env('ADMIN_EMAIL'))->send(new SystemEmail($message));
    }
}