This describes two different semantics for a DKIM signature.  Where does the 
current DKIM specification provide for such distinction in the semantics, so 
that it can be reliably and accurately interpreted by a verifying agent?
I don't think it does.  And I think this is a problem.
As always, I would appreciate a description of the problem that you
believe that needs to be solved.  Not "multiple message signatures", a
problem that affects the way that people use their e-mail.  After all,
we've already agreed that the amount of list mail with forged
originator addresses is extremely small, so that can't be it.
R's,
John
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