I reviewed this document as part of the Applications and Real-Time (ART) Area Review Team's ongoing effort to review all IETF documents being processed by the IESG. These comments were written primarily for the benefit of the ART Area Directors. Document authors, document editors, and WG Chairs should treat these comments just like any other IETF Last Call comments.

Thanks for this document! I believe it is basically ready.

Please see below a few minor comments.

Best,
/Marco



[Abstract]

* The IDnits checker reports the following:

> -- The draft header indicates that this document obsoletes RFC7489, but the abstract doesn't seem to mention this, which it should.
>
> -- The draft header indicates that this document updates RFC6591, but the abstract doesn't seem to mention this, which it should.


[Section 2]

* Just a suggestion: the text from "Failure reports represent a possible denial-of-service attack ..." until the end of the section could be more appropriate for security considerations.

  It might be moved to a new Section 8.1 "Denial of Service", which Section 2 can point to.


[Section 5]

* "Without this check, a bad actor ..."

  Which check? I guess it can be clarified in two possible ways.

  1. Expand the sentence to say something like: "Without checking and successfully verifying the authenticity, trustworthiness, and aware participation of an external destination, a bad actor ..."

  or

  2. Make the following editing:

     - Change "Without this check, a bad actor could publish ..." to "This prevents a bad actor from publishing ..."

     - Change "Therefore, in case of external ..." to be "In case of external ..."

     - Swap the second and third paragraph.


[Section 6]

* It says:

  > which is part of ""Messaging Abuse Reporting Format" registry, ...

  It should say:

  > which is part of the "Messaging Abuse Reporting Format (MARF) Parameters" registry group, ...


[Nits]

* Abstract
--- s/"failure reports," or/"failure reports", or

* Section 3
--- s/and [RFC6652] respectively/and [RFC6652], respectively

* Section 7.1
--- s/e.g. RFC5322/e.g., RFC5322

* Section 7.3
--- s/And all of/All of