I've found that automated mail including opt-in newsletters, E-commerce receipts, and product notifications, and renewal notices commonly fail the BADHEADERS, SPAMHEADERS and HELOBOGUS tests.
Just to clarify here for those that aren't aware -- the BADHEADERS and SPAMHEADERS test both look for headers that are rare in mail sent from legitimate mail clients, and are fairly common in spam. The difference in that the BADHEADERS test includes non-RFC-compliant headers, whereas the SPAMHEADERS test includes headers that are technically valid. So a legitimate E-mail should NEVER fail the BADHEADERS test -- and it is therefore normally safe to block on it (since it is not a valid E-mail, and many mailserver will block the E-mail). However, the SPAMHEADERS test will catch a fair amount of legitimate E-mail from poorly designed mail clients.
In this case, the weighting system helps out a lot, by only blocking E-mail that fails multiple tests.
Note that we will work with any company that is sending out E-mails that fail either test (at no charge) to help them fix their problems.
-Scott
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