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I got some false negatives here which contain a fake email address as
real name. As many MUAs display real names instead of addresses if real
name is present, most people will think the From: address is what's in the
real name part if this looks like a valid email address.

Maybe we should catch something like:
- From =~ (.*\@.*) <(.*\@.*)>
where $1 ne $2

Would that be hard to implement?
My first guess would be catching both
- From =~ (.*\@.*) <(.*\@.*)>
and
- From =~ (.*\@.*) <\1>
and assinging the latter one the first one's score multiplied by -1. On my
personal email I never found an @ character in the real name part unless
the address is repeated as the real name part. (I guess some MUAs do)

This probably won't catch a lot of spam (haven't seen it a lot) but
shouldn't produce false positives either.

Jan



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