Javamail Transport.send problem

Question

I send an email once in a while from my web application on a virtual dedicated server. Usually the email works. But sometimes Transport.send hangs up. Processing just stops at that statement. I don’t get anything from debug.
public class SendEmail {
    public void SendEmail(String toEmailAddress,
            String fromEmailAddress,
            String smtphost, String subject, String content)
            throws AddressException, MessagingException {
        // Create a mail session
        java.util.Properties props = new java.util.Properties();
        props.put("mail.smtp.host", smtphost);
        props.put("mail.debug", "true");
        Session session = Session.getInstance(props, null);
        // Construct the message
        Message msg = new MimeMessage(session);
        msg.setFrom(new InternetAddress(fromEmailAddress;));
        msg.setRecipient(Message.RecipientType.TO, new InternetAddress(toEmailAddress));
        msg.setSubject(subject);
        msg.setText(content);
        // Send the message
        Transport.send(msg);
        return;
}What could be causing the problem with Transport.send? Any help would be very much appreciated. Thanks.

Answer 1

I didn’t get anything from debug. No messages at all. I'm on Centos and looked at the console. Is this not correct?
I added this code to try to capture exceptions:
try {
            Transport.send(msg);
        } catch (Exception e) {
            try {
                out = new BufferedWriter(new FileWriter("TestLog.txt", true));
                out.newLine();
                out.write(e.getMessage());
                out.newLine();
                out.close(); 
            } catch (Exception err) {
            } finally {
        } finally {
            }But I haven't been able to duplicate the problem since then. I'm not familiar with jstack, so I'll have to research it.
Thanks for your response.