public function MailOpenDispositionNotifications($account_id, $mail_id, $type = "open")
{
// $account_id : IDType
// $mail_id : IDType
// $type : string (enum 'open' or 'ignore')
$this->CheckAndSetHeader(__FUNCTION__);
$reg_args["operation"]["account_id"] = $account_id;
$reg_args["operation"]["mail_id"] = $mail_id;
$reg_args["operation"]["type"] = $type;
$this->encodeString($reg_args);
$results = parent::MailOpenDispositionNotifications($reg_args);
$this->methodClose();
return $this->decodeString($results->mail);
}