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From: Simon Josefsson <jas@extundo.com>
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Subject: Re: [ANNOUNCE] contrib/hashcash.el spam fighter
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David Masterson <dsm@rawbw.com> writes:

>>>>>> Simon Josefsson writes:
>
>> Pay Hashcash
>> ============
>
> Interesting.  Is this technique any better than TMDA (tmda.sf.net)?

It is different.  Today, it is probably not "better", but in limited
communities it could be effective.