public function MailGetMailsById($mail_ids)
 {
     // $mail_ids : IDType or this array
     $this->CheckAndSetHeader(__FUNCTION__);
     $reg_args["mail_id"] = $this->getRegularArgs($mail_ids, __FUNCTION__);
     $this->encodeString($reg_args);
     $results = parent::MailGetMailsById($reg_args);
     $this->methodClose();
     return $this->decodeString($results->mail);
 }