For anyone interested (who's still using Imail's anti-spam as I am), I've come up with a combination of DNS based blacklists which is proving to be VERY effective with no false positives. Note - I have the server set to trash an email if ANY ONE of these find a server listed. Here it is:
FYI, at least 2 of those tests would each catch about 1% of our legitimate mail (all those tests combined would probably result in about 2% false positive ratio here). So while it may be very effective for you, others should be very careful before following the advice (most people seem to aim for a false positive ratio of about .1% or better).
-Scott
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