Postfix Configuration to split mail between Apps on same host

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http://www.linuxquestions.org – Hi, I am looking for a guide to Postfix configuration. I have an OpenSuse 11.2 system that is running 2 BBS systems independently, both of which are capable of receiving smtp mail on prot 25. What I would like to do is set up Postfix on the OpenSuse OS to receive all mail for both those domains and then send the relevant mail to the correct BBS. I would therefore have Postfix listening on Port 25 External and the 2 BBS applications listening on different ports on the localhost address. At least that is the plan. Can anyone provide some pointers on how to do this. I want to do it a (HowTos)