/**
  * Unsubscribe member
  *
  * @param string $email  The email address of the member to unsubscribe.
  *
  * @throws \Exception
  */
 public function unsubscribe($email)
 {
     // Delete user from all list
     $this->service->delete_user($email);
     // Blacklist user
     $this->service->create_update_user(array('email' => $email, 'attributes' => array(), 'blacklisted' => 1, 'listid' => array(), 'listid_unlink' => array(), 'blacklisted_sms' => 1));
 }