John Levine wrote:
But actually, we haven't moved it, since the bad guy can use the same
stamp to send multiple spams to the same victim unless the bank also
cancels the stamps.
Or unless the receiving system does elementary checks for the same stamp
being used multiple times. But obviously, since your main interest is
convincing everyone that e-postage is impossible, you're going to assume
that the receiving system is implemented without even the most blatantly
obvious checks.
mathew
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