Just joined list, so forgive me if this has been beat to death. But we just added the 8.05 spam filtering to our system, and all hell has broken loose with our clients. They're complaining like mad that their legit email is being caught.
Occasionally, our Declude JunkMail customers have a similar problem. Here are the steps to take:
[1] Gather information about E-mails that were blocked (to/from/time are the most important)
[2] Check the log files to verify that the E-mail was received
[3] Check to see what spam test(s) the E-mail failed
In most cases, this will identify tests that you should not be using, as they have many false positives. Typically what happens with our customers is that they ignore our advice of using the weighting system, and start tweaking the settings without understanding what the various spam tests do. For example, they see a test named "SPAMHEADERS", and assume that it only blocks spam (hey, it has "spam" in the name, right?), and start blocking all E-mail that fails that one spam test.
In general, if you use a pass/fail approach (blocking all E-mail that fails a single spam test, which we do not recommend), you want to use as few tests as possible, and only ones with an extremely low false positive ratio. If you are using a weighting system (ranging from the "X tests failed" approach in IMail v8's anti-spam to individual weights per test or other options), you want to use a lot of tests, as each one helps both improve spam detection and minimize false positives.
-Scott
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