You could use spamassassin and amavisd-new.
They work very well together.
You should be able to find information on setting them up with courier mta at this url
http://perlstalker.amigo.net/tiki/tiki-print.php?page=CourierAmavisd-new



On Mon, 2006-06-26 at 12:27 -0400, Mark Bucciarelli wrote:
I need to filter outgoing mail for spam and have come up with an
approach.  I'm wondering if anyone else here has implemented a
solution to this problem, and am posting to let you all shoot
holes or suggest improvments. :).

    1. Create separate smtp server that only webmail can connect
       to.

    2. On this courier instance, 
       cat > esmtproutes
       :[ip-of-current-outgoing-mail-server]
       ^D

    3. Wrap Vipul's Razor in Courier::Filter module.

    4. Reject mail if Vipul says so.

This approach assumes courierfilter will run before esmtproutes
gets evaluated and used?

Is this assumption correct?

As a related question, do folks here add to Vipul's checksum
database in any kind of bulk way?  If so, how?  I was thinking I
could pipe any mail that got a hit on cbl.abuseat.org to a daemon
that reports it as spam to Vipul.  Not great, but I guess I would
trust cbl more than user training of dspam.   I could just do my
own spam, but that seems wimpy given the vast volume of spam
flowing to our mail servers.

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