Jesse,

may I chime in that discussion, focusing on one point: you mentioned
you've found that most people are repelled by the TMDA idea.  Is this
anecdotal evidence, or did you do an actual study or do you know of
any studies other people might have done?

When you say "TMDA concept", which aspects of that concept do you
mean: do you mean the C/R protocol, the blacklisting, the
whitelisting, the keyword addresses or the combination of all that? 
What is particularly repelling?

I was contemplating a system that uses only a small subset of TMDA
features; and I'm wondering if it wouldn't be as efficient as TMDA in
preventing spam and helping people prioritize their email.  In
particular, suppose you decided *not* to rely on sender verification
(which isn't available anyway) in any way whatsoever.  Rather, you
require that all mail you read be sent to a keyword address. 
Conversely, all email sent to your public address would be challenged
- unlike the way TMDA is currently used, however, a successful
response would also result in a keyword address being issued to the
responder that they must use for future communication if they want to
avoid repeated challenges.

In short, in such a scheme that would be no need for whitelisting or
blacklisting whatsoever; the system would be entirely token-based: if
you hold a token from me (a keyword address) you can send me email. 
If all you have is my public email address, you have to get a token
first.  Whenever I want someone to send me mail (my family, my
students, my boss, a mailing list) I issue a keyword address for that
particular purpose.  Of course, such a system would require extensive
database/mail client support to make sure I can issue (and if
necessary, revoke) keyword addresses quickly and to ensure that I can
quickly sort my email based on the likely sender.

  - Godmar

On Thu, 16 Sep 2004 13:45:41 -0400, Jesse Guardiani <[EMAIL PROTECTED]> wrote:
> years, but we have less than 100 TMDA users. (We've
> found that most people are repelled by the TMDA concept,
> despite the fact that it WORKS, and WORKS WELL.)
>
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