Sample 1 (VIRTUAL DOAMIN)

Oct 30 20:15:51 primary postfix/cleanup[21829]: CDA6533547: message-id=<20061031011551.CDA6533547@mail.pssnet.com>
Oct 30 20:15:51 primary postfix/qmgr[6025]: CDA6533547: from=<postmaster@pssnet.com>, size=256, nrcpt=1 (queue active)
Oct 30 20:15:57 primary postfix/smtp[22108]: CDA6533547: to=<mrhankey@mms.ca>, relay=mail.mmsdirect.com[206.248.140.206], delay=6, status=undeliverable (host mail.mmsdirect.com[206.248.140.206] said: 550 <mrhankey@mms.ca>: User unknown (in reply to RCPT TO command))
Oct 30 20:15:57 primary postfix/qmgr[6025]: CDA6533547: removed

Sample 2 (Real DOMAIN)

Oct 30 19:36:54 primary postfix/cleanup[19876]: E638833547: message-id=<20061031003654.E638833547@mail.pssnet.com>
Oct 30 19:36:54 primary postfix/qmgr[6025]: E638833547: from=<postmaster@pssnet.com>, size=256, nrcpt=1 (queue active)
Oct 30 19:36:55 primary postfix/smtp[20435]: E638833547: to=<charltonmatthew@mmsdirect.com>, relay=mail.mmsdirect.com[206.248.140.206], delay=1, status=deliverable (250 Ok)
Oct 30 19:36:55 primary postfix/qmgr[6025]: E638833547: removed