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I saw a very nice tool http://tmda.net It spools the e-mail and ask the sender to acknowledge he sent the e-mail. It is only after the acknowldegement is received that the e-mail is finally distributed. I think this system coupled with other anti-spam techniques (like open-relays blockers,...) is very effective. Finally if mail servers were not open relays out of the box, we would be in a better world...
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