student-admission/app/Http/Controllers/MailController.php

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use Illuminate\Support\Facades\Mail;
use App\Mail\SignUp; 

class MailController extends Controller
{
    public function sendMail()
    {
        Mail::to('test@mail.com')->send(new SignUp());
    }
}