Just to clarify my point-of-view, I don't see the recent spam
discussions as resulting in significant new text in RFC5231bis. What I
imagine for RFC5321bis is at most some very slight tweaking of the
wording. As far as I can tell it was just a coincidence that the
issue with the IETF MTA cropped up at about the same time you started to
ask about 5321bis.
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