    @Test
    public void testSendWithHeaders() throws SendWithUsException
    {

        Map<String, String> headers = new HashMap<String, String>();
        headers.put("X-Auto-Response-Suppress", "header-value");

        SendWithUsSendRequest request = new SendWithUsSendRequest()
                .setEmailId(EMAIL_ID).setRecipient(defaultRecipientParams)
                .setSender(defaultSenderParams).setEmailData(defaultDataParams)
                .setHeaders(headers);

        SendReceipt sendReceipt = sendwithusAPI.send(request);

        assertSuccessfulAPIReceipt(sendReceipt);
    }