[hashcash] Mutt and hashcash

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I wrote a stand-in for sendmail that I can call from Mutt to add hashcash
to my outgoing mail.  It does a bit more than just that, though.

The computer I use for email is a modest 400MHz.  Computing 26 bits of
hashcash (my chosen default) takes nearly ten minutes.

Given that, my filter is actually two programs.  One acts like sendmail for
Mutt and merely writes Mutt's message to a queue.  The other program is a
daemon that watches that queue and does the work of adding hashcash before
sending it to the real sendmail.

I just started doing this last week, and I haven't yet run out of things I
want to change about these two, but they already work fairly well for me.
Sending from Mutt is quick, but the mail might not actually go out for a
while.

Details (and code) available on request.
- -- 
Kyle Hasselbacher            A paperless office is as likely as
kyle@xxxxxxxxxxx                    a paperless bathroom.
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