The gold standard seems to be Declude Standard version, but the price tag is too hefty for me to push through with the boss (he wants to stop the spam, but doesn't want to spend the money on tools to stop it, go figure.) Declude Late doesn't offer multi-hop support which seems to be a good chunk of the stuff we are seeing.
A bunch comes in through out ISPs mail server which is acting as secondary.
Don't use a backup MX that cannot implement the same policies as the primary MX. You're paying the price of unfiltered spam, but how many times has the backup MX been useful when your primary MX has been down? So you could probably make a big reduction in spam, immediately and for free, by 1) removing the backup MX records from DNS and 2) telling the ISP to stop relaying your mail through that machine.
Len
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