public function getSendQuota()
    {
        $this->_action = 'GetSendQuota';
        $this->_method = 'GET';
        $this->_refreshDate();

        $this->_generateSignature();
        $res = $this->_request();
        if ($res['code'] == 200) {
            $result = $res['body']->GetSendQuotaResult;
            return array(
                'MaxSendRate' => (string) $result->Max24HourSend,
                'SentLast24Hours' => (string) $result->SentLast24Hours,
                'MaxSendRate' => (string) $result->MaxSendRate
            );
        } else {
            return new SimpleEmailServiceError((string) $res['body']->Error->Code);
        }
        throw new Exception(self::ERROR);
    }