FWIW, Storm Lake just bought TrimMail, an appliance to handle our spam. 
http://www.trimmail.com/

The company is from the Quad cities.(Gotta support IA companies when we
can.)

The appliance needed only a DNS change - updating the MX record.   Mail
goes  to it first.  The box's default setting of "5" missed 10% of our
spam. Set now at "4," it catches 99% of our spam and gets better by the
day, learning what's spam. It has had only 1 false positive in two weeks
of running, now whitelisted, an insurance company that is normally "an
online advertiser."  (One of our users has a business acquaintance at the
company.)

It uses mostly bayesian filtering, running 10 tests.  As each piece of
mail gets one of the tests, it gets a score of zero or 1.  As it gets to a
total of 4 or greater, it gets labeled <<JUNK>> and can be auto-deleted by
the appliance or the mail client.  One of the tests is a service, updated
weekly by the company.  We've got it set to NOT autodelete so we can
monitor false positives.

With our users setting their mail clients to delete <<JUNK>> silently,
it's been very nice.  Now our "church lady" no longer gets "those" emails
- you know the ones I mean.  (Can't type it here or this'll get blocked.) 
I have regained 90 minutes/day not having to update blacklists. Life is
good again.

Steve Scarbrough, Technology Coordinator
Storm Lake Community School District
419 Lake Avenue
Storm Lake, IA  50588
712.732.8100   fax:8101
[EMAIL PROTECTED]
http://mail.storm-lake.k12.ia.us/~sscarbrough/

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