The idea behind this test is that a very large percentage of spam uses return addresses that are completely bogus (typically either the recipient's address or another recipient's address), and therefore would be sent from an IP that isn't in the MX records that correspond to the sender's E-mail address. While it is a good sign of spam, quite a bit of legitimate mail is sent that way as well. The negative weight means that if an E-mail does not fail that test, it will get a negative weight. So those smaller companies that have other problems (such as no reverse DNS entry) will get "credit" for sending their mail from an IP that is listed in their MX records.>Yes -- the default is: > > IPNOTINMX ipnotinmx x x 0 -4Now I am confused. (Not the first, won't be the last.) Why would you assign a negative weight? It seems like this test is to see if the mail came from other that a domain registered mail server, and if so, it would be an indication of possible SPAM, there by saying we should have it add weight to the weighting system, not subtract weight.
-Scott
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