In <855023508(_dot_)1075118192(_at_)[172(_dot_)23(_dot_)65(_dot_)45]> Greg
Connor <gconnor(_at_)nekodojo(_dot_)org> writes:
Interestingly, my sendmail/pop server shows "Return-Path:" (always at
the very top) but my Exchange server doesn't show Return-Path at all.
Perhaps Return-Path: is not consistent. Sort of bad news for SPF if
it isn't.
Adding the Return-Path: header is not required and many MTAs don't do
it. Some use Sender: instead, some many use things like
Envelope-From:. I forget all the variations.
A good place to find the answer would be to check out the development
version of SpamAssassin and/or ask Justin Mason.
However, if the MTA does SPF checks, it should generate a
Received-SPF: header which will include the envelope-from.
-wayne
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