The problem is pretty clearly economic in that sending spam is close
to free; it probably makes sense to look at economic solutions. As
far back as 1995, Marshall Rose was charging (via First Virtual) to
read email from you if you were not on a white list. Perhaps the IETF
should consider standardizing such a charging mechanisms?
from the give credit where credit is due department:
i got the idea from a larry niven novel.
from the practicality department:
the more you're willing to invest on the "receiving mail" side,
the less you care about spam
of course, this doesn't solve the spam-is-global-warming issue, but at least
i get to stay nice and cool...
/mtr