Transport sendMessage doesn't throw exception

Question

I send message to invalid email address, but I doesn't get any exception. It works like everything is good, and in debugger it shows as everything is normal.

private MailService() {
    Properties props = new Properties();
    props.put("mail.transport.protocol", "smtps");
    props.put("mail.smtps.host", HOST);
    props.put("mail.smtps.auth", "true");
    props.put("mail.smtp.from", FROM);
    props.put("mail.smtps.quitwait", "false");

    mailSession = Session.getDefaultInstance(props);
    mailSession.setDebug(true);
}

public static void sendMessage(String recipient, String subject,
        String message) throws MessagingException {

    if (mailService == null) {
        mailService = new MailService();
    }

    MimeMessage mimeMessage = new MimeMessage(mailSession);

    mimeMessage.setFrom(new InternetAddress(FROM));
    mimeMessage.setSender(new InternetAddress(FROM));
    mimeMessage.setSubject(subject);
    mimeMessage.setContent(message, "text/plain");

    mimeMessage.addRecipient(Message.RecipientType.TO, new InternetAddress(recipient));

    Transport transport = mailSession.getTransport("smtps");
    transport.connect(HOST, PORT, USER, PASSWORD);

    transport.sendMessage(mimeMessage,
            mimeMessage.getRecipients(Message.RecipientType.TO));
    transport.close();

}

I tried for different email addresses, and for all it didn't throw exception. What do I wrong ?

Answer 1

A TransportListener won't tell you anything more than an exception will tell you. The real answer to your question is in the JavaMail FAQ.

Answer 2

What you need is an TransportListener, which is attached to your transport-instance:
adding TransportListener

transport.addTransportListener(new MyTransportListener());

MyTransportListener.java

public class MyTransportListener implements TransportListener{

    @Override
    public void messageDelivered(TransportEvent te) {
        System.out.println("Everything went fine!");
    }

    @Override
    public void messageNotDelivered(TransportEvent te) {
        System.out.println("ERROR: " + te.getMessage());
        Address[] invalidAddresses = te.getInvalidAddresses();
        Address[] validUnsentAddresses = te.getValidUnsentAddresses();
        //make something happen
    }

    @Override
    public void messagePartiallyDelivered(TransportEvent te) {
        messageNotDelivered(te);
    }

}

I din't try this (yet), but I think this is exactly what you need...
EDIT
I was wrong, this won't help with your problem