On Tue, 16 Aug 2005, Douglas Otis wrote:
When efforts to capture the RCPT TO prove expensive, this is only expensive
for the sender, not the recipient.
Not true if the recipient site has to deal with multiple copies of a
message where previously it only had to deal with one.
There were already schemes looking to artificially increase burdens on the
email senders as a type of rate limiting.
They don't work, because of zombie armies. They don't work even if you
assume there are no zombie armies, because if you raise the cost enough
to discourage spammers then you'll damage legitimate senders.
Tony.
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