Lately I'm seeing (and got reports) of scam emails
which have a peculiar header, here's an example
http://scamoftheday.com/wordpress/2010/09/06/respond-if-interested-in-my-proposal/
just look at the "content-type" (and charset) header
and you'll see what I mean; that wrong header does
probably come from some buggy mailsender app
which doesn't correctly understand line breaks in
config files; anyways, I think that a regexp matching
that header may help rejecting those messages
HTH
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