Name resolution issue

[3RiversTechAdmin]

Hey,

I have a problem, if my zimbra server recieves a message for- user@hostname.domainname it rejects the message and sends it to its relay server. I want it to treat user@hostname.domainname as equv. to user@domainname. Any ideas?

lhost postfix/smtpd[20885]: connect from localhost[127.0.0.1]
Oct 9 16:41:08 localhost postfix/smtpd[20885]: F02A76BCBE: client=localhost[127.0.0.1]
Oct 9 16:41:09 localhost postfix/cleanup[20815]: F02A76BCBE: message-id=<20061009214007.DB7AF6BCBC@badger>
Oct 9 16:41:09 localhost postfix/qmgr[23626]: F02A76BCBE: from=<test@test.com>, size=4909, nrcpt=1 (queue active)
Oct 9 16:41:09 localhost postfix/smtpd[20885]: disconnect from localhost[127.0.0.1]
Oct 9 16:41:09 localhost amavis[24758]: (24758-04) FWD via SMTP: <test@test.com> -> <tarndt@badger.3riverstech.com>, 250 2.6.0 Ok, id=24758-04, from MTA([127.0.0.1]:10025): 250 Ok: queued as F02A76BCBE
Oct 9 16:41:09 localhost amavis[24758]: (24758-04) Passed SPAMMY, LOCAL [192.168.7.1] [127.0.0.1] <test@test.com> -> <tarndt@badger.3riverstech.com>, Message-ID: <20061009214007.DB7AF6BCBC@badger>, mail_id: TnrfQ+P37DvT, Hits: 7.78, queued_as: F02A76BCBE, 288 ms
Oct 9 16:41:09 localhost postfix/smtp[20875]: A780B6BCBC: to=<tarndt@badger.3riverstech.com>, relay=127.0.0.1[127.0.0.1], delay=1, status=sent (250 2.6.0 Ok, id=24758-04, from MTA([127.0.0.1]:10025): 250 Ok: queued as F02A76BCBE)
Oct 9 16:41:09 localhost postfix/qmgr[23626]: A780B6BCBC: removed
Oct 9 16:41:10 localhost postfix/smtp[20889]: F02A76BCBE: to=<tarndt@badger.3riverstech.com>, relay=oldnt.3riverstech.com[192.168.7.1], delay=2, status=sent (250 2.0.0 k99Lf9JG019160 Message accepted for delivery)
Oct 9 16:41:10 localhost postfix/qmgr[23626]: F02A76BCBE: removed