邮件推送api问题

代码仿照java sdk

public void sample() {

    IClientProfile profile = DefaultProfile.getProfile("cn-hangzhou", "<your accessKey>", "<your accessSecret>");
// 如果是除杭州region外的其它region（如新加坡region）， 需要做如下处理
    //try {
    //DefaultProfile.addEndpoint("dm.ap-southeast-1.aliyuncs.com", "ap-southeast-1", "Dm",  "dm.ap-southeast-1.aliyuncs.com");
    //} catch (ClientException e) {
    //e.printStackTrace();
    //}
    IAcsClient client = new DefaultAcsClient(profile);
    SingleSendMailRequest request = new SingleSendMailRequest();
    try {
     //request.setVersion("2017-06-22");// 如果是除杭州region外的其它region（如新加坡region）,必须指定为2017-06-22
        request.setAccountName("控制台创建的发信地址");
        request.setFromAlias("发信人昵称");
        request.setAddressType(1);
        request.setTagName("控制台创建的标签");
        request.setReplyToAddress(true);
        request.setToAddress("目标地址");
        request.setSubject("邮件主题");
        request.setHtmlBody("邮件正文");
        SingleSendMailResponse httpResponse = client.getAcsResponse(request);
    } catch (ServerException e) {
        e.printStackTrace();
    }
    catch (ClientException e) {
        e.printStackTrace();
    }
}

出现ServiceUnavailable : The request has failed due to a temporary failure of the server.的错误