I've seen that most of the spam emails, regardless of the weight, seem to fail the SPAMHEADERS, BADHEADERS, and IPNOTINMX tests. Question: do you guys HOLD email based on any of these three tests? If so, how is this done? Is this a smart approach?
The SPAMHEADERS test will catch quite a bit of legitimate E-mail (mostly solicited E-mail, such as orders and bulk E-mail from companies you have done business with, as opposed to individual person-to-person E-mail), mostly because of all the web mailers that were written by web developers rather than purchased or written by web programmers.
The IPNOTINMX test shouldn't be used to block E-mail, as it is one of the few tests that it is OK for a legitimate mailserver to fail. This is often the case with larger domains, where there are separate mailservers for incoming vs. outgoing E-mail.
The BADHEADERS test, though, now catches about 50% of all spam, and will never catch any legitimate E-mail (unless it is sent from a broken mail client that needs to be fixed, and where you might not have received the E-mail anyways).
-Scott
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