LinuxQuestions.org - Java send mail error on Linux

Hi All,
I have a simple java program that sends an email.

Code:



public void sendMail(String content, String date) {



                try {

                        boolean debug = false;



                        // Set the host smtp address

                        Properties props = new Properties();

                        //props.put("mail.smtp.host", "localhost");



                        // create some properties and get the default Session

                        Session session = Session.getDefaultInstance(props, null);

                        session.setDebug(debug);



                        // create a message

                        javax.mail.Message msg = new MimeMessage(session);



                        // set the from and to address

                        InternetAddress addressFrom = new InternetAddress("sbutt@TTainment.de");

                        msg.setFrom(addressFrom);



                        InternetAddress[] addressTo = new InternetAddress[1];

                        addressTo[0] = new InternetAddress("sbutt@gmail.com");



                        msg.setRecipients(javax.mail.Message.RecipientType.TO, addressTo);



                        // Optional : You can also set your custom headers in the Email if

                        // you Want

                        // msg.addHeader("MyHeaderName", "myHeaderValue");



                        // Setting the Subject and Content Type



                        msg.setSubject("LCP Analysis Report :: " + date

                                        + " = Machine : "

                                        + InetAddress.getLocalHost().getHostName());

                        msg.setContent(content, "text/xml");

                        Transport.send(msg);

                        System.out.println("Email sent!!!");

                        



                } catch (UnknownHostException ex) {

                        ex.printStackTrace();

                } catch (MessagingException ex) {

                        ex.printStackTrace();

                }

        }

I get no exception and can see the "Email sent!!!" message after execution of the program.

But when i look into my linux "/var/log/mail.log", i see this error:

Code:



Sep 25 17:22:35 HH-Linux1 sm-mta[16301]: q8PFMNQe016301: from=<sbutt@TTainment.de>, size=3465, class=0, nrcpts=1, msgid=<15735326.0.1348586543811.JavaMail.root@HH-Linux1>, proto=ESMTP, daemon=MTA-v4, relay=root@localhost [127.0.0.1]

Sep 25 17:22:41 HH-Linux1 sm-mta[16324]: q8PFMNQe016301: to=<sbutt@gmail.com>, delay=00:00:06, xdelay=00:00:06, mailer=relay, pri=123465, relay=travel.TTainment.de, dsn=5.1.2, stat=Host unknown (Name server: travel.TTainment.de: host not found)

Sep 25 17:22:41 HH-Linux1 sm-mta[16324]: q8PFMNQe016301: q8PFMfQe016324: DSN: Host unknown (Name server: travel.TTainment.de: host not found)

Sep 25 17:22:41 HH-Linux1 sm-mta[16324]: q8PFMfQe016324: to=<sbutt@TTainment.de>, delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=30000, relay=travel.TTainment.de, dsn=5.1.2, stat=Host unknown (Name server: travel.TTainment.de: host not found)

Sep 25 17:22:41 HH-Linux1 sm-mta[16324]: q8PFMfQe016324: q8PFMfQf016324: return to sender: Host unknown (Name server: travel.TTainment.de: host not found)

Sep 25 17:22:41 HH-Linux1 sm-mta[16324]: q8PFMfQf016324: to=fuji, delay=00:00:00, xdelay=00:00:00, mailer=local, pri=30000, dsn=2.0.0, stat=Sent

And email is also not received.

Could someone please suggest how, where and what to configure in Linux to have this problem resolved?

Thanks.