Question

While writing an Email application in java I getting this exception:

javax.mail.MessagingException: Could not connect to SMTP host: mail.simsystech.com, port: 8443;
  nested exception is:
    java.net.ConnectException: Connection timed out: connect
    at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1934)
    at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:638)
    at javax.mail.Service.connect(Service.java:317)

& here is my code(follow this tutorial link) :

          Properties properties = System.getProperties();
          properties.put("mail.smtp.starttls.enable", "true");
          properties.put("mail.transport.protocol", "smtp");
          properties.setProperty("mail.smtp.host", host);
//        properties.put("mail.smtp.port", "8443");
          properties.setProperty("mail.smtp.auth", "true");
          properties.setProperty("mail.smtp.starttls.enable", "true");

          final String user = "[e-mail]";
          final String password = "*****";

          Authenticator authenticator = new Authenticator() {
                protected PasswordAuthentication getPasswordAuthentication() {
                    return new PasswordAuthentication(user,password);
                }
            };


          Session session = Session.getDefaultInstance(properties,authenticator);


          try{
              MimeMessage message = new MimeMessage(session);

              message.setFrom(new InternetAddress(sid));

              message.addRecipient(Message.RecipientType.TO,
                                       new InternetAddress(rid));

              message.setSubject(subject);

              BodyPart messageBodyPart = new MimeBodyPart();

              messageBodyPart.setText(text);

              Multipart multipart = new MimeMultipart();

              multipart.addBodyPart(messageBodyPart);


              messageBodyPart = new MimeBodyPart();
//            String filename = "file.txt";
              DataSource source = new FileDataSource(file);
              messageBodyPart.setDataHandler(new DataHandler(source));
              messageBodyPart.setFileName(file);
              multipart.addBodyPart(messageBodyPart);

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


              // Now set the actual message
//            message.setText(text);

              // Send message
              Transport.send(message);
              System.out.println("Sent message successfully....");
           }catch (MessagingException ex) {
              ex.printStackTrace();
           }

Though I have gone through these links of stackoverflow : 1, 2

Any idea why I’m getting this error… 🙁 🙁

Answer 1

Assuming that no network issues occur with your connection (you can use telnet to make sure of it) then…

The problem must be because of the properties.setProperty("mail.smtp.starttls.enable", "true");

According to javadoc of com.sun.mail.smtp ,

If true, enables the use of the STARTTLS command (if supported by the server) to switch the connection to a TLS-protected connection before issuing any login commands. Note that an appropriate trust store must configured so that the client will trust the server’s certificate. Defaults to false.

And below says for mail.smtp.starttls.required

If true, requires the use of the STARTTLS command. If the server doesn’t support the STARTTLS command, or the command fails, the connect method will fail. Defaults to false.

Try removing the above property if your provider doesn’t support it.