/**
  * @see Action::execute()
  */
 public function execute()
 {
     parent::execute();
     $subscriber = new NewsletterSubscriber($this->subscriberID);
     if ($subscriber->userID) {
         $user = new User($subscriber->userID);
         NewsletterUtil::sendUserValidationEmail($user);
     } else {
         NewsletterUtil::sendGuestValidationEmail($subscriber);
     }
     $this->executed();
     HeaderUtil::redirect('index.php?page=NewsletterSubscriberList&success=success&packageID=' . PACKAGE_ID . SID_ARG_2ND_NOT_ENCODED);
     exit;
 }