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Re: IETF SMTP Working Group Proposal at

  • From: J.A. Terranson
  • Date: Thu Aug 22 20:37:24 2002

On Thu, 22 Aug 2002, Brad Knowles wrote:

> At 7:20 PM -0500 2002/08/21, J.A. Terranson wrote:
> >  Presenting a computationally difficult problem to a connecting MTA
> >  moves the requirement for the CPU power to the sender while keeping
> >  the recipient site unfettered.  Let's face it, the spam problem is
> >  merely one of cost shifting from sender to reciever, and this
> >  proposal shifts the load back.  Any site that wishes to maintain
> >  the current system of email subsidies to the sender domain need
> >  only provide a computationally simple token.
> 	Now this is more plausible.  You'd still need something akin to a
> PKI to distribute the computationally simple tokens, and you'd need a
> way to easily revoke them.  But if this was implemented by default in
> the standard MTAs, you would go from hundreds or thousands of message
> deliveries per minute to five or more minutes per un-authenticated
> message delivery.
> 	This is something that might be worth discussing in the
> appropriate forums, such as the SMTP-related working groups of the

Thank You Brad.  I think it is aslo and elegant very cleasn solution
to a divisive social issue - the placing of the transmission
costs on firmaly of the SELLER, without binding up the innoced

I have very serious deoubts that a sender will even offer
you the oppotunity if they get you Ba computationally difficult token.

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