I've done this a few times and it works really well. I use Linux, Postfix, SpamAssassin, ClamAV, and a super lightweight cut down version of the now-dead Amavisd-lite.
I use this system as an inbound email relay on, or outside, the corporate firewall boundary and put Exchange inside. That way if the relay system comes under attack Exchange still works correctly inside the firewall. I configure the firewall to only allow my outside email relay to send inbound traffic to the Exchange server. In order to avoid accepting email for users I don't have I've got a script that reaches into the Active Directory through LDAP and gets a list of legal email recipients every day. I found the script on the net somewhere but I had to tweak the output a little to make Postfix happy. Jeff Moss -----Original Message----- From: Henry Kwan [mailto:[EMAIL PROTECTED] Sent: Wednesday, April 09, 2008 2:24 PM To: users@spamassassin.apache.org Subject: Configuring SA as frontend to Exchange Hi, Have been running SA on CentOS for a few years now and everything has been working great. But the powers that be want to move to Exchange so I am trying to plan a SA frontend that feeds the Exchange server. As I was thinking over how SA works now and how it might work in the my future setup, I was wondering how you would feed unmarked spam to the SA frontend? Since email is passed through to Exchange, it isn't stored on the SA server anymore like it is now. Or would I be limited to just having SA autolearn? Also, if anyone has some good links to setting up a SA frontend to Exchange, that would be much appreciated. Thanks!
