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There's better ways to eliminate spam. For example, you could require a hashcash or digital cash micropayment before you will accept a message from someone you've never corresponded with before.

Hashcash is free, but computationally intensive to make. If spammers had to compute a 26 bit hashcash micropayment for every single message they send, it would limit them to about 100-200 messages a day per computer. Their business would quickly become unprofitable.

See http://www.cypherspace.org/~adam/hashcas h/