Mail Routing to domain and sub-domain

Mon Oct 13 13:48:12 PDT 2003

The previous thread on sub-domains inspired me to post this question.

Problem: Mail sent to sub-domain test.pdi.com goes to domain pdi.com. For
example, if I send a message to dave at test.pdi.com, it is routed to
dave at pdi.com instead. Looking at the headers, it's as if something has 
stripped off the test subdomain. Here's a copy of the header:

Date: Mon, 13 Oct 2003 11:49:42 -0700 (PDT)
From: David Fent <dave at pdi.com>
To: dave at pdi.com
Subject: Text MX
Message-ID: <Pine.LNX.4.44.0310131149320.18385-100000 at zaboo.pdi.com>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII

Infrastructure: pdi.com is our primary domain. test.pdi.com is a test
domain for Windows Active Directory and Exchange. Since we serve the
test.pdi.com domain from the same server, we simply use a spcl.domain file
and include it after running h2n. So, the _windows zones such as
_msdcs.test.pdi.com are all served properly. The mail server on pdi.com is
running postfix rather than sendmail.

Objective: If mail is directed to dave at test.pdi.com, I want it to go to
the exchange mail server in the test.pdi.com domain.

Addtl Notes: I have added an MX record in the form of:

test.pdi.com. NS MX 5 aleph.test.pdi.com.  (aleph is the exchange server)

Unfortunately, this doesn't seem to do the trick. I also added
test.pdi.com to the resolver on the mail server. Maybe the mail server is
not using dns to determine mail routing? Or it's has the domain hard coded
somewhere?  I'm not an expert in this area by any means, so any
suggestions you may have will be most appreciated. I've already hit the
ISC archives, but didn't find anything that helped - may be looking for
the wrong thing though. Postfix archives are next.

Thank You, Dave