JavaMail BASE64_LENGTH_79_INF 垃圾邮件

Question

当我尝试通过javamail api发送邮件时，发往收件人的邮件被转为垃圾邮件。原因如下 BASE64_LENGTH_79_INF 和MIME_HTML_ONLY

public void sendEmail(String to, String subject, String body, File filename ) {
        String Host = "ip";

        java.util.Properties props = new java.util.Properties();
        props.put("mail.smtp.host", Host);

        javax.mail.Session mailSession = javax.mail.Session.getDefaultInstance(props, null);
        mailSession.setDebug(true);
        MimeMessage message = new MimeMessage(mailSession);
        try {
            message.setFrom(new InternetAddress("some@email"));
            InternetAddress[] address = {new InternetAddress(to)};
            message.setRecipients(Message.RecipientType.TO, address);
            message.setSubject(subject);



        BodyPart messageBodyPart = new MimeBodyPart();

         // Now set the actual message
         messageBodyPart.setContent(body, "text/html; charset=utf-8");

         // Create a multipar message
         Multipart multipart = new MimeMultipart();

         // Set text message part
         multipart.addBodyPart(messageBodyPart);

         // Part two is attachment
         messageBodyPart = new MimeBodyPart();

         DataSource source = new FileDataSource(filename);

         messageBodyPart.setDataHandler(new DataHandler(source));
         System.out.println("-----------------------------------");
         System.out.println(filename.getName());
         messageBodyPart.setFileName(filename.getName());
         multipart.addBodyPart(messageBodyPart);

         // Send the complete message parts
         message.setContent(multipart);     

         // Send message
         Transport.send(message);

         System.out.println("Sent message successfully....");

        } catch (MessagingException ex) {
            ex.printStackTrace();
        }

有办法通过吗？

谢谢你了

Answer 1

MIME_HTML_ONLY里面有介绍。我想从我的站点发送HTML邮件，但Outlook将它们标记为垃圾邮件。

如果您对邮件正文部分进行base64编码，JavaMail使用的是一个 每行76字节的默认值. 尽量在附加信息主体部分之前对其进行base64编码。