> > fwiw: there is a nice concept called Tripoli, see
> > http://www.pfir.org/tripoli-overview
> A nice scheme against spam, I read about some time ago, was about
> requiring the email sender to compute a computationally difficult
> challenge before the email was accepted, for uknown/untrusted senders
How do you know if the sender was known/trusted? HowNothing can be trusted
except fro the IP address of the immediate connector, or the digital
signature. Everything else is easily forged.
The only ubiquitous solution is S/MIME.
--- Noel
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