/**
  * Sends email with activation link.
  * @param User $user
  * @author anza
  */
 private function sendActivationLink(User $user)
 {
     $subject = Bundle::get('register.mail.subject');
     $message = URL::getInstance()->getCustomActionURL('auth', 'activate') . SLASH . $user->getActivation();
     Mailer::send($user->getEmail(), $subject, $message);
 }