At the same time, MUAs are getting smarter. In particular,
the presence
of language classifiers (Bayes, et al) in desktop-user (as opposed to
technical-user) MUAs is likely to become much more prevalent
over the next
few years.
The more filters are deployed the greater the need will be for
mechanisms that make sure that false positives are not being
lost.
The spam problem has grown so large that the second order problems
are becomming significant in their own right.
Authentication approaches and filtering approaches go together.
Phill
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