Jonathan Morton wrote:
That leaves one big category: Web Mail. The likes of Hotmail and Yahoo
don't charge for sending e-mail from their systems, except perhaps in
terms of banner ads. They also handle ginormous amounts of said mail,
which could make a proof-of-work switch-on relatively difficult for
them. However, most of their clients are low-end home users, who, on
average, may have relatively favourable contact patterns. For this, we
could do with more statistics.
There is also possibility of the senders browser computing the token. See:
http://www.lapo.it/HashCash.html
Adam
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