您的观察是正确的，此时 EmailComposeTask 不支持附件，并且这是目前唯一可以从设备以编程方式发送电子邮件的工具.

Your observation is correct, at this point in time EmailComposeTask doesn't support attachments and this is the only facility to send email programatically from the device at the moment.

如您所见，您可以与可以代表您的应用执行此任务的服务器进行通信.

As you note, you can communicate with a server which can perform this task on behalf of your app.