pls check
[root@mail Desktop]# tail -f /var/log/maillog
Apr 2 10:22:31 mail postfix/qmgr[2661]: D5420640341: removed
Apr 2 10:22:37 mail postfix/smtp[5837]: AD1DB640344: to=<root@localhost.warsawinternational.net>, relay=none, delay=5.5, delays=0.07/0.01/5.5/0, dsn=4.4.3, status=deferred (Host or domain name not found. Name service error for name=localhost.warsawinternational.net type=A: Host not found, try again)
Apr 2 10:31:14 mail postfix/qmgr[2661]: AD1DB640344: from=<user@localhost.warsawinternational.net>, size=16631, nrcpt=1 (queue active)
Apr 2 10:31:15 mail postfix/smtp[5923]: AD1DB640344: to=<root@localhost.warsawinternational.net>, relay=none, delay=524, delays=523/0.03/0.74/0, dsn=5.4.6, status=bounced (mail for localhost.warsawinternational.net loops back to myself)
Apr 2 10:31:15 mail postfix/cleanup[5925]: 8A16B640346: message-id=<20130402050115.8A16B640346@mail.warsawinternational.net>
Apr 2 10:31:15 mail postfix/bounce[5924]: AD1DB640344: sender non-delivery notification: 8A16B640346
Apr 2 10:31:15 mail postfix/qmgr[2661]: 8A16B640346: from=<>, size=18803, nrcpt=1 (queue active)
Apr 2 10:31:15 mail postfix/qmgr[2661]: AD1DB640344: removed
Apr 2 10:31:16 mail postfix/smtp[5923]: 8A16B640346: to=<user@localhost.warsawinternational.net>, relay=none, delay=0.5, delays=0.07/0/0.43/0, dsn=5.4.6, status=bounced (mail for localhost.warsawinternational.net loops back to myself)
Apr 2 10:31:16 mail postfix/qmgr[2661]: 8A16B640346: removed