Laravel Email Validation letting "user@hotmail" through

I am using Laravel's Validation through FormRequest. An extract of the code is here. It seems laravel's validation is letting email addresses like "user@hotmail" through.

namespace App\Http\Requests;

use Illuminate\Foundation\Http\FormRequest;

class DirectorForm extends FormRequest
{
    public function rules()
    {
        return [
            'email' => 'required|email',
        ];
    }
}

it seems the above validation allows "username@hotmail", which isn't a valid email address.

Did i set it up wrongly

via Chebli Mohamed