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From: Simon Josefsson <jas@extundo.com>
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Subject: Re: new spam functionality added
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Florian Weimer <fw@deneb.enyo.de> writes:

> Stainless Steel Rat <ratinox@peorth.gweep.net> writes:
>
>> The idea is to make every sending MTA spend a bit of CPU time doing
>> something in a proveable way before accepting their messages.
>
> This would be the death of mailing lists, wouldn't it?

Pretty much so, I think.  That's why I think hashcash needs to be
computed at the machine that sends the original mail; X-Hashcash that
is.  The current implementation isn't very good though, as it stalls
Emacs while computing hashcash.

Hashcash with ~< 25 bits is just a toy, you need more bits to make it
costly for spammers.