On Tue, 26 Apr 2011 13:22:15 +0100, Alessandro Vesely <ves...@tana.it>  
wrote:

> I guess Message-ID is among those "structural, not semantic" fields.
> I concur.  However, we miss a field that says an MTA is _knowingly_
> breaking whatever signatures may be present.

The Message-ID gets copied into the References of replies. I can imagine a  
situation where a scammer changed the Message-ID in order to make a  
message appear in the wrong thread (most MUAs try to display messages in  
threads, and do it in a sufficiently similar manner that such a scam might  
work).

The same might even be true of Content-Type (though the scammer would have  
to be pretty smart to dream up a viable mechanism). But, sadly, scammers  
ARE smart :-( .

-- 
Charles H. Lindsey ---------At Home, doing my own thing------------------------
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