/**
  *
  * @param array $request
  */
 public function sendMassEmail($request)
 {
     if (is_array($request)) {
         $messages = array();
         foreach ($request as $r) {
             $email = new \SoapVar($r, SOAP_ENC_OBJECT, 'MassEmailMessage', $this->namespace);
             array_push($messages, $email);
         }
         $arg->messages = $messages;
         return parent::_sendEmail($arg);
     } else {
         $backtrace = debug_backtrace();
         die('Please pass in array to this function:  ' . $backtrace[0]['function']);
     }
 }