Postfix forward all inbound mail to another server
I have two mail servers one of which is on a Linux box, Trustix and the other a Exchange 2003.
All is up and running expect one small link in the chain.
I have fetchmail polling all outside pop boxes, which then passes to postfix, which I would like to forward all message onto the exchange server, without keeping a copy locally.
The two servers are on fixed ip addresses. Postfix will do all the av and spam work and then forward to exchange server each message.
I have seen some stuff about relay host, but isn't that related to allowing other domains to send mail via my postfix box?
How do I do this, all message forewarding ?!?