We have been using both iMail spam filtering and Declude JunkMail for a few months and have worked on the configuration for both constantly. For whatever reason, we still have a LOT of users calling about good email being filtered into the junk mail box.
The only blacklists we are using are SpamCop and SpamHaus (both services). In addition we have set up statistical, phrase, HTML filtering in iMail and using weight filtering through Declude. Some of our users have set up their own rules to filter back into the MAIN box, but this technique is not acceptable for everyone... What else can we do to stop good mail from being filtering?
The first thing to do is determine *why* the E-mails are getting caught. From that, you can determine what to change.
For example, E-mail from AOL, Yahoo, and Hotmail all fail the NOPOSTMASTER and NOABUSE tests. If you're blocking mail that fails one of those tests, you'll block a lot of legitimate mail.
To find out what test(s) the E-mails are failing, you can either look at the headers or the appropriate log files.
Most likely, you have some strict spam settings that are causing this. For example, if you block all E-mail that fails the SPAMCOP test, you'll see occasional false positives.
-Scott
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