/**
  * @param  MandantInterface    $mandant
  * @param  NewsletterInterface $newsletter
  * @param  SubscriberInterface $subscriber
  * @param $context
  * @return string
  */
 public function unsubscribelink(MandantInterface $mandant, NewsletterInterface $newsletter, SubscriberInterface $subscriber, $context)
 {
     return $this->router->generate('ibrows_newsletter_unsubscribe', array('mandantHash' => $mandant->getHash(), 'newsletterHash' => $newsletter->getHash(), 'subscriberHash' => $subscriber->getHash(), 'context' => $context), true);
 }