/**
  * {@inheritdoc}
  */
 protected function sendBulk(MessageInterface $message, array $recipients)
 {
     $emails = array();
     foreach ($recipients as $recipient) {
         $emails[$recipient->getInfo('email')] = $recipient->getInfo('email');
     }
     $mail = $message->getFormatted('swiftmailer');
     $mail->setTo($emails);
     $this->mailer->send($mail);
 }