Mac OS X Question

Hello folks.. first post here. ;)

Installed the 3.1 Network Edition on OS X. No problems whatsoever there - up and running great. My question involves the domain. I've sent a test message to an external account. Here are the headers:

Code:

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Received: from localhost (localhost [127.0.0.1])
        by Zimbra.local (Postfix) with ESMTP id 206ED82554;
        Wed,  3 May 2006 16:39:20 -0500 (CDT)
Received: from Zimbra.local ([127.0.0.1])
 by localhost (Zimbra.local [127.0.0.1]) (amavisd-new, port 10024) with ESMTP
 id 02064-01; Wed,  3 May 2006 16:39:18 -0500 (CDT)
Received: from Zimbra.local (unknown [192.168.1.29])
        by Zimbra.local (Postfix) with ESMTP id A9BB18253D;
        Wed,  3 May 2006 16:39:18 -0500 (CDT)

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Does anyone know how to change that "Zimbra.local" part?

Zimbra.local is your server name. You could use a DNS value like mail.domain.com this is best done at install time.