MICROSOFT IS UNFOLDING something it calls the Penny Black project in which people sending emails might have to pay for the privilege.
Microsoft claims in an article on its web site that the "Penny Black" project wants to reduce spam by making senders pay.
In the same article, Microsoft says it is contemplating different ways a sender might pay, including "plain old cash", CPU cycles, memory cycles and Turing tests.
The firm has already put together formal analyses of a CPU based scheme which it calls "a plausible memory based function". It also says it knows how to implement Turing tests and knows how to issue a ticket server.
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