Relay to Exchange inside a firewall

[Michael Sage]

Hello,

As a relative Linux newbie, I need some help setting up qmail to relay ALL
mail for 'domain.com' to an Exchange server inside a firewall. The firewall
access is easy, and I will have my MX record pointing to the qmail box
outside the firewall. What I need help with is: Is there a simple
configuration adjustment that I can make to accomplish this?

Deep thanks,
Michael