function setHTMLContent($mailingId, $html, $doImageGrabbing = true, $doLinkTracking = false)
    {
        $queryParameters = array(
            'doImageGrabbing' => ($doImageGrabbing == TRUE) ? "true" : "false",
            'doLinkTracking' => ($doLinkTracking == TRUE) ? "true" : "false"
        );
        return $this->post('mailings/' . $mailingId . '/contents/html', $html, $queryParameters, "text/html");
    }