Could not connect to SMTP host: smtp.gmail.com, port: 587; nested exception is: java.net.ConnectException: Connection timed out: connect

Question

Here is the code of the application. I have been trying to run this using eclipse IDE. I also added all the required java mail jar files namely dsn.jar,imap.jar,mailapi.j

Answer 1

As I said, there's nothing wrong with your code. If anything, just to do some testing, try to drop the Authentication part to see if that works:

    public void sendPlainTextEmail(String host, String port,
            final String userName, final String password, String toAddress,
            String subject, String message) throws AddressException,
            MessagingException {

        // sets SMTP server properties
        Properties properties = new Properties();
        properties.put("mail.smtp.host", host);
        properties.put("mail.smtp.port", port);
        properties.put("mail.smtp.auth", "true");
        properties.put("mail.smtp.starttls.enable", "true");
// *** BEGIN CHANGE
        properties.put("mail.smtp.user", userName);

        // creates a new session, no Authenticator (will connect() later)
        Session session = Session.getDefaultInstance(properties);
// *** END CHANGE

        // creates a new e-mail message
        Message msg = new MimeMessage(session);

        msg.setFrom(new InternetAddress(userName));
        InternetAddress[] toAddresses = { new InternetAddress(toAddress) };
        msg.setRecipients(Message.RecipientType.TO, toAddresses);
        msg.setSubject(subject);
        msg.setSentDate(new Date());
        // set plain text message
        msg.setText(message);

// *** BEGIN CHANGE
        // sends the e-mail
        Transport t = session.getTransport("smtp");
        t.connect(userName, password);
        t.sendMessage(msg, msg.getAllRecipients());
        t.close();
// *** END CHANGE

    }

That's the code I'm using every day to send dozens of emails from my application, and it is 100% guaranteed to work -- as long as smtp.gmail.com:587 is reachable, of course.