public function getScheduledMailings() {
        $data['Envelope'] = array(
            'Body' => array(
                'GetSentMailingsForOrg' => array(
                    'SCHEDULED' => null,
                ),
            ),
        );
        $response = $this->_request($data);
        $result = $response["Envelope"]["Body"]["RESULT"];
        if ($this->_isSuccess($result)) {
            return $result;
        } else {
            throw new Exception("Silverpop says: ".$response["Envelope"]["Body"]["Fault"]["FaultString"]);
        }
    }