sendmail routing

From: Bruce Shaw (Bruce.Shaw@gov.ab.ca)
Date: Wed Jul 13 2005 - 10:51:34 EDT


I'm buried behind a firewall and a corporate mail server that I don't have
access to. As it stands, to allow sendmail to route to this remote server,
that server has to expose my server's IP to DNS and hence the rest of the
world which is a Bad Thing.

What I want to do is route all my UNIX mail to one server per building and
then have that server send it to the corporate mail server. There is one
single mail domain.

Here's sort of what I want it to look like. Let's pretend we're in
george.com.

mail.george.com - corporate mail server

fred - mail server for building one it fowards everything to
mail.george.com
john - another server in building one. it sends its mail to fred who sends
it to mail.george.com

harry - mail server for building two it forwards everything to
mail.george.com
sally - another server in building two. it sends its mail to harry to sends
it to mail.george.com

What entries to I need to put in main.cf and/or sendmail.cf and/or
local-host-names to make this happen?

I've RTFMed various mans and webpages but they're making assumptions that I
can't implement as I don't control the corporate mail server or its MX
records.

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