Qmail as a forwarder

[Julian L. Cardarelli]

Dear group,   I was wondering how can I setup Qmail so that it forwards all incoming mail to another host.. I have a firewall and it would be useful to have a non-mission-critical mail server acting as the smtp server for our domain.  The other mail machine we have is an exchange box and if it were attacked we would lose the ability to communicate both internally & externally.. Any ideas?   Julian