[hashcash] mailserver support for hashcash [was: response to "proof of work proves not to work"?]

"Eric S. Johansson" <esj@xxxxxxxxxx> writes:
> model of stamp usage and why it has relatively low load.  Then I'll
> append to it a summary of rebuttals to the proof of work doesn't work
> paper.

I would be very, very interested in linking to this paper once it is
posted.  Please let me know how it goes.

> I should point out however that we need people to write code.

That's what I do.  I've written what I believe is the only serious
open source Java mail server (I *still* can't find any other that
serves IMAP) with a variety of anti-spam technologies; currently I
use Vipul's Razor as a first pass and my own custom challenge-response
as a second pass.  It also can "filter" or "proxy" IMAP/POP3
connections, for example providing an IMAP front-end to GMail.

  http://mail.ibex.org/src/org/ibex/mail/
  http://mail.ibex.org/src/org/ibex/mail/protocol/

It's currently running on megacz.com:{25,119,143}.

I would really like to build in support for a hashcash style
proof-of-work and set it "on by default" for new installs provided
that:

  1) The protocol is standardized, and there is a reasonable consensus
     that the standard will become dominant

  2) There is a good, solid, well-written, professional-looking,
     *sound* rebuttal to "proof of work proves not to work" that I can
     point to when people complain about spammers and zombie machines
     making the whole thing pointless.  Ideally it should include
     calculations at least as detailed as the paper it's rebutting.

  - a

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