我试图通过mailgun客户端发送带有附件的电子邮件，电子邮件已发送但没有附件 .

Client client = Client.create();
StringBuffer sb = new StringBuffer();sb.append("Test");File file =  new File(fileName);formData.add("html",sb.toString());formData.add("attachment",file);
ClientResponse response=webResource.type(MediaType.APPLICATION_FORM_URLENCODED).post(ClientResponse.class, formData);

为什么不附加文件？

mailgun