RainLab\User\Models\MailBlocker::blockAll PHP Method

    public static function blockAll($user)
    {
        return static::addBlock('*', $user);
    }

 public function formAfterUpdate($model)
 {
     $blockMail = post('User[block_mail]', false);
     if ($blockMail !== false) {
         $blockMail ? MailBlocker::blockAll($model) : MailBlocker::unblockAll($model);
     }
 }