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      Yahoo! wants to reinvent the postage stamp to cut spam. Researchers are testing a scheme where users pay a cent to charity for each email they send – so clearing their inbox and conscience simultaneously.

     Yahoo! Research's CentMail resurrects an old idea: that levying a charge on every email sent would instantly make spamming uneconomic. But because the cent paid for an accredited “stamp” to appear on each email goes to charity, CentMail's inventors think it will be more successful than previous approaches to make email cost. They think the cost to users is offset by the good feeling of giving to charity.