By way of seeking some efficiency, let me prime the pump: One study has shown
that roughly 90% of the SPF-registered email is spam. That's really not a
surprising statistic, absent any common assessment services. However, assuming
that domain name-oriented assessment services become common, it seems reasonable
to expect most signed mail to be from good actors rather than bad actors, since
the bad actors will not see any benefit from doing signing.
no, it doesn't follow. in particular, it presumes that the present "bad
actors" and the future "bad actors" are similar, or that they're engaged
in similar activity. it's entirely likely that authentication will
change the behavior of bad actors, but that doesn't mean that bad actors
won't benefit by signing mail.
Keith
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