Yes, you can setup a Linux box to receive incoming mail (running
SpamAssassin) and then forward it to the Exchange server.  Here's a howto
I followed a couple years ago to do exactly what you want:

http://www.geocities.com/scottlhenderson/spamfilter.html

You can email the author as well for additional assistance.  Or, I'm sure
several people on this list (including myself) would be happy to assist
you.
Thanks,
~Matt


On Mon, 5 Apr 2004, plug wrote:

> I work for one of the valley's high school districts, and we are
> interested in filtering spam.  We currently are using Exchange 2003.  We
> are looking at putting a box between the Exchange machine and the
> Internet to filter incoming, and possibly outgoing, messages.  We are
> looking at Spamassassin, amongst several commercial products.  We
> haven't made any decisions, yet.  We are currently on a tight budget, so
> this would be a chance for FOSS to shine.  Although, if anyone has had a
> particularly good experience with a commercial product, I would be
> interested in hearing about that, too.
> 
> We are hoping the application with run on either Windows or Linux
> (SuSE).  We have over 30,000 e-mail users, although most of the students
> don't generate much e-mail.  It is a fairly sizeable installation, and
> performance is of concern.
> 
> Thank you, in advance, for your input!
> -Erik Bixby
> ---------------------------------------------------
> PLUG-discuss mailing list - PLUG-discuss@lists.plug.phoenix.az.us
> To subscribe, unsubscribe, or to change  you mail settings:
> http://lists.PLUG.phoenix.az.us/mailman/listinfo/plug-discuss
> 

---------------------------------------------------
PLUG-discuss mailing list - PLUG-discuss@lists.plug.phoenix.az.us
To subscribe, unsubscribe, or to change  you mail settings:
http://lists.PLUG.phoenix.az.us/mailman/listinfo/plug-discuss