Sending an email within a Java Application

Hi all,

I decided to pick up the old textbook and start to learn more about Java (I know, I should understand most of it by this point :D).

I am focusing on the interaction between the application and sending of emails. As I eventually want to port this code to android studio and use it to create an email application for android.

Here is the code:

public static void main(String[] args) {
        // Recipient's email ID needs to be mentioned.
        String to = "example";

        // Sender's email ID needs to be mentioned
        String from = "example";

        // Setting the host and port
        String host = "smtp.gmail.com";
        String port = "465";

        // Get system properties
        Properties properties = System.getProperties();

        // Setup mail server
        properties.setProperty("mail.smtp.host", host);
        properties.setProperty("mail.smtp.port", port);

        properties.setProperty("mail.user", "example");
        properties.setProperty("mail.password", "example");

        // Get the default Session object.
        Session session = Session.getDefaultInstance(properties);

        try {
            // Create a default MimeMessage object.
            MimeMessage message = new MimeMessage(session);

            // Set From: header field of the header.
            message.setFrom(new InternetAddress(from));

            // Set To: header field of the header.
            message.addRecipient(Message.RecipientType.TO, new InternetAddress(to));

            // Set Subject: header field
            message.setSubject("This is the Subject Line!");

            // Now set the actual message
            message.setText("This is actual message");

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

My code no longer fails to connect or times out, it just continues to run (likely until my system crashes). After stepping through the code - it seems to hang right at

Transport.send(message);

Since it never throws an error, I cannot get an exception code or any details.

If you guys could take a look at my code and point out any mistakes, that'd be awesome.

Thanks!!!