Laravel E-mail Validation

How can I validate email address and make them unique? my problem is when i save and did not input email it will still stored here is my email

my Validation Request

 $this->validate($request, [ 
        'email_ad' => 'required|email|unique:clients'
    ]);

from Newest questions tagged laravel-5 - Stack Overflow https://ift.tt/2Sl13Kq
via IFTTT