Hi there --

I completed the installation of the TurnKey 11.1/Joomla16 appliance onto one of our servers, and I am testing the postfix server. The test that I am doing involves running the following command

mail ahkaplan@partners.org < /etc/fstab && tail -f /var/log/mail.log

The e-mail does not reach the intended recipient, and the text shown below was taken from the mail.log file:

Sep  9 22:16:24 joomla16 postfix/pickup[4179]: C967E9C0FB7: uid=0 from=<root>
Sep  9 22:16:24 joomla16 postfix/cleanup[4273]: C967E9C0FB7: message-id=<20110909221624.C967E9C0FB7@localhost>
Sep  9 22:16:24 joomla16 postfix/qmgr[4180]: C967E9C0FB7: from=<root@localhost>, size=1011, nrcpt=1 (queue active)
Sep  9 22:16:24 joomla16 postfix/local[4277]: C967E9C0FB7: to=<ahkaplan@partners.org>, relay=local, delay=0.2, delays=0.12/0/0/0.08, dsn=5.1.1, status=bounced (unknown user: "ahkaplan")
Sep  9 22:16:24 joomla16 postfix/cleanup[4273]: F1B409C0FBD: message-id=<20110909221624.F1B409C0FBD@localhost>
Sep  9 22:16:25 joomla16 postfix/bounce[4278]: C967E9C0FB7: sender non-delivery notification: F1B409C0FBD
Sep  9 22:16:25 joomla16 postfix/qmgr[4180]: F1B409C0FBD: from=<>, size=2666, nrcpt=1 (queue active)
Sep  9 22:16:25 joomla16 postfix/qmgr[4180]: C967E9C0FB7: removed
Sep  9 22:16:25 joomla16 postfix/local[4277]: F1B409C0FBD: to=<root@localhost>, relay=local, delay=0.16, delays=0.08/0/0/0.09, dsn=2.0.0, status=sent (delivered to mailbox)
Sep  9 22:16:25 joomla16 postfix/qmgr[4180]: F1B409C0FBD: removed

I went through the motions of modifying the /etc/postfix/main.cf file so that the mydestination line includes the domain suffixes of my company, and the inet_interfaces line has the all option.  What other step(s) do I need to take in order get e-mail delivery working for the server?

Thanks.