Mail Routing Issues

[Jason Burzenski]

Hello All,

I apologize if this question is too off topic as it relates more to sendmail
than it does to MailScanner.

Im running MailScanner 4.22-5, sendmail 8.12.9, spamassassin 2.55 on RH 9.0.
My mailscanner server is setup on my lan and is connected to the internet
via NAT (ex.ter.nal.ip > 192.168.1.51).  The server is configured to resolve
DNS from an internal dns server (192.168.1.2).  The server is configured to
route mail for 3 domains, (a.com, b.com, c.com) from the internet to an
internal communigate server (192.168.1.13).

The internal DNS server is not setup with any MX information for a.com b.com
or c.com.  My mailertable looks like:
        a.com  smtp:[192.168.1.13]
        b.com  smtp:[192.168.1.13]
        c.com  smtp:[192.168.1.13]

The [] should imply that MX records should be ignored for routing.
Everything works fine for weeks and weeks.  Then one day, a DNS change is
made to b.com and now b.com is returning "canonical name = www.b.com" from
an MX query on the 192.168.1.2 server.  Messages are still routing to
communigate but now they are being rewritten with a To: field =
username at www.b.com instead of username at b.com.  Now communigate starts
bouncing messages because it cant find these users in the domain.

Why would sendmail re-write the To: field and how can I avoid this?  I want
sendmail to route mail exactly as I say it should and not reference DNS for
the domains I have routing enabled for.  What am I doing wrong?

Thanks,

Jason Burzenski
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