I've always thought that the likelihood of a protocol level solution for
this issue is pretty close to zero if not zero. The various proposed
solutions in the problem draft haven't given me any reason to dissuade
me of that notion.
That said, I think that we might be able to catalog some clues that
something is suspicious which taken with many other clues can be used to
by a receiver to make an ultimate decision of spamminess. A good example
is the unsigned To: and Subject: lines. Even if it's strictly allowed by
the spec, that doesn't mean it's not suspect. It could be really useful
to collect this clues as input signals to a larger preponderance of
evidence.
Mike
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