A number of heuristics include increasing the computation required to
send and receive an email, for example one to a few minutes of computation
per email on desktop computers.
Presume an adversary with computing resources that routinely range in
the area of "tens of millions of systems", with all the processing,
memory, disk, and bandwidth resources that implies. Presume that those
systems are capable of coordinated or independent tasks as designated
by the adversary. Show how this approach will have a meaningful effect
on the adversary's ability to generate/transmit [SMTP] spam.
Simultaneously, presume the existence of hundreds of thousands of highly
useful mailing lists (e.g., "ietf", "nanog") with varying numbers of
members and show how this approach will not adversely affect their
ability to function in the way they've been functioning for decades.
I don't think you can do this. I think you're trying to drown someone
who owns the ocean, and that the attempt is futile. But perhaps you have
an approach that's eluded others, that overcomes the obvious problems,
and I just don't see it yet due to insufficient caffeine intake.
---rsk
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