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An anonymous reader writes with the technique of Nolisting, which fights spam by specifying a primary MX that is always unavailable. The page is an extensive FAQ and how-to guide that addressed the objections I immediately came up with.
Nice trick, but now that it's published you can bet that the spammers are already at work. Two weeks, tops, and the botnets will be updated to try both the primary and secondary MXs....
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