R. David Murray <rdmur...@bitdance.com> added the comment:

I think we can treat this as a bug.  However...

What if there is more than one set of Resent- headers?  I think that it is not 
possible to guarantee we only look at the most recent set, since the RFC 
provides no way to identify a "set".  Heuristically we could probably guess 
right 99% of the time, but we'd still be guessing.  Further, the RFC actually 
prohibits using the Resent- headers for "automated processing", though, 
granted, it is talking about the receiving end, not the sending end.

My inclination at this point is to fix the Sender bug, and to refuse to guess 
when there are any Resent- headers (throw a ValueError).  I've queried the 
email-sig to see what they think.

----------
versions: +Python 3.3

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<http://bugs.python.org/issue12147>
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