>> What's the point?  Neither SPF nor DKIM use it.  It's in the copy of
>> the message if you want it, just like all the other headers.
>
>I thought the idea is that the second MIME part of a multipart/report
>includes things that might be keys to searching logs or otherwise
>uniquely identifying the message at the sender's side, as well as
>including the technical specifics of the report.

It never has in the past.  As we said in RFC 5965:

       This section is intended to convey meta-data about the report
       in question that may not be readily available from the included
       email message itself.

>But you're right that it's duplicated data if the third part is
>included, and for ARF it always is.

Exactly.  The second section is "here's why we hate this message",
not "here's the message you sent."

R's,
John

PS: Is someone planning to revise the draft and try to fix it?
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