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Ray Heasman wrote:

> Hi,
> 
> Making a sender spend some time on a hash is not a new idea, but
> nobody seems to have come up with something useful and feasible. I
> have implemented something that I hope will be convenient and simple
> enough for users, but make life expensive enough for spammers that
> they will go away.
> 

Hashcash makes basicly the same. Please see www.hashcash.org. I think
it would be quite easy to implement in TMDA.

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