>I imagine this is worth noting in a Privacy Considerations or Security
>Considerations paragraph or two, but not something that needs to be
>repaired in the protocol somehow.

It's purely a documentation issue.  If R sends reports to S, it's
going to reveal something about how third parties relayed mail from S
to R.  That will reveal something about who those third parties are,
and in some cases may allow report recipients to deduce information
about some of of R's users.

Any plausible fix would be incredibly cumbersome, along the lines of
requiring the third party domains that show up in bounce addresses and
signatures to publish policy records saying it's OK to include them in
reports.  It'd be totally impossible to audit, since those third
parties have no way to see what's being reported about them.

R's,
John


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