嵌入图像的消息在JavaMail中不起作用

Question

这是代码的一部分。当我不使用此代码消息发送时。

messageBodyPart=new MimeBodyPart();
            DataSource fds=new FileDataSource("btn2.png");
            messageBodyPart.setDataHandler(new DataHandler(fds));
            messageBodyPart.setHeader("Content-ID","<image>");
            messageBodyPart.addHeader("Content-Type","image/png");
            messageBodyPart.setDisposition(MimeBodyPart.INLINE);
            multipart.addBodyPart(messageBodyPart);

但是当我添加此代码消息而不是发送时。 这是完整的代码。

Properties props=System.getProperties();
            String fromm="ffff@ffff.fffff.fff";
            String pass="ffffffffff";
            String to="afffffffffff@gmail.com";


            props.put("mail.smtp.starttls.enable",true);
            props.put("mail.smtp.host","ggg.ggg.ggg.gggg");
            props.put("mail.smtp.user",fromm);
            props.put("mail.smtp.password",pass);
            props.put("mail.smtp.port","587");
            props.put("mail.smtp.auth",true);
            Session session=Session.getInstance(props,null);
            MimeMessage message=new MimeMessage(session);

            InternetAddress from=new InternetAddress(fromm);
            message.setSubject("Salam mailiniz var");
            message.setFrom(from);
                                         message.addRecipients(Message.RecipientType.TO,InternetAddress.parse(to));

            Multipart multipart=new MimeMultipart();
            BodyPart messageBodyPart=new MimeBodyPart();
            String htmlText="<H1>Hello from the outside Hello, can you hear me?</H1><img src=\"cid:image\">";
            messageBodyPart.setContent(htmlText,"text/html; charset=utf-8");
            multipart.addBodyPart(messageBodyPart);

            messageBodyPart=new MimeBodyPart();
            DataSource fds=new FileDataSource("btn2.png");
            messageBodyPart.setDataHandler(new DataHandler(fds));
            messageBodyPart.setHeader("Content-ID","<image>");
            messageBodyPart.addHeader("Content-Type","image/png");
            messageBodyPart.setDisposition(MimeBodyPart.INLINE);
            multipart.addBodyPart(messageBodyPart);
            message.setContent(multipart);


            Transport transport=session.getTransport("smtp");
            transport.connect("mail.mct.gov.az",fromm,pass);
            transport.sendMessage(message,message.getAllRecipients());