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Personally I do not reject email based on missing or incorrect DNS of any kind. I do reject on a lot of other things, but that's a whole different topic. Let me just say that the last piece of spam that actually made it on to my server was on 18-Dec-2005, and that's without any contentfiltering or the use of any external blocklists or any other external services.
Let me add to that ... also without graylisting or anything else of that nature. I either block the connection entirely at my router, or accept the email, or reject it with a permanent rejection error code (5xy).
Ken http://www.kensims.net/ Opinions expressed are my own and do not necessarily represent the views of my employer or anyone in their right mind.
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