From: Brian Collins (listbcnewnanutilities.org)
Date: Thu Aug 30 2007 - 09:01:06 CDT

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> Well, I have 2 servers in two different locations.
>
> The Windows Server which runs a MTA called Postmaster. This machine is
> the
> machine where users will download their mail from. Since we cannot change
> the OS to Linux on this machine (far too many users!) and Spamassassin for
> Windows is so useless, I want to set up the second server on Fedora 6/7 to
> scan for mails and virusses and then pass the scanned (cleaned) mail back
> to
> the Windows server.
>
> Is this possible?

Certainly. What you want is a good idea even if the backend server runs
Linux.

There are many ways to go about it, but in a nutshell, the Postfix server
will be the MX for your domains (I assume you're familiar with setting up
DNS MX records). Have the Postfix box do all your filtering work (RBLs,
greylisting if you choose, Spamassassin, virus filtering, etc.) and make
sure it rejects unknown recipients so you avoid being a source of
backscatter (http://www.postfix.org/BACKSCATTER_README.html). I recommend
using Amavis to do both virus and spam filtering. It works very well with
Postfix.

I do this for our Exchange server here, and it works well. I also do the
same filtering for several Linux backend servers. I have a "here's how I
did it" on my wiki site:
http://wiki.rbcollins.net/index.php/Postfix_mail_filter
It's not necessarily the best way; it's what works for me. Use that to help
you along, not as a step-by-step guide. I'd also recommend you get The Book
of Postfix. And don't be afraid to use Google and the list archives.
You'll find most of your answers in the latter.

--Brian

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