> > would only get worse.  As far as I can see, it would be difficult to
> > write a think cash client which used smtp.

It wouldn't be at all hard to write a think cash feedback system which
used SMTP. You'd just add a think cash authentication stage to the file
insertion layer and then any think cash authenticated key index insertion
would pop up a think cash dialog. It's somewhat analagous to authorization
realms for web sites. You point your browser at the web site. It
interrupts you with a login/password dialog. You type it in. It continues
on as normal.

I'm considering integrating optional think cash support into IndexClient
as it seems popular among the freesite publishers. Integrating it into
IndexClient would of course make it automatically integrated into EOF
SMTP. The question is how to come up with system which is generalized
enough to implement in a generic way and how to indicate whether an index
uses think cash authentication or not so that the library will know when
to use it.



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>=20
> Think cash is a stupid idea, and won't work in practice.  You don't
> want to be trying to solve puzzles when you really just want to send
> your email or post messages.

There are only two ways I can think of to have a communications system
with a public address that isn't mechanically spammable:

1) Think Cash.  BTW, I don't really agree that they wont work in practice,=
=20
   you can make a puzzle that is trivial for a human but difficult for
   a machine.  Not just trivial, but even fairly non-intrusive. =20

2) Cryptographic permission based email.  This would entail generating a
   'credit' that you give to a person you want to email you.  He/she can
   perform a calculation with the credit and say the day/hour when the
   email will be sent.  Your email client then checks for the key that=20
   calculation generates.  Only the people you issue credits to can=20
   send you email.  For this reason its no good for email where just
   anybody can send you something.  For that you need (1) or you issue
   a few credits and post them on your freesite and hope they dont colide.


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