Benjamin Kaduk has entered the following ballot position for
draft-ietf-uta-mta-sts-17: No Objection

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COMMENT:
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Thanks for the well-written document!  Other people have noted some things 
already,
so I can only add small things.

Section 3.1

Did you consider ABNF that would let new versions be defined without
having to redefine the ABNF?


Section 3.2

   When fetching a policy, senders SHOULD validate that the media type
   is "text/plain" to guard against cases where webservers allow
   untrusted users to host non-text content (typically, HTML or images)
   at a user-defined path.  All parameters other charset=utf-8 or
   charset=us-ascii are ignored.

Nit: "other than"


Section 5

Should the "enforce" text also mention the STARTTLS requirement from
Section 4?


Section 7.2

It's probably better to cite this as BCP 195 than RFC 7525 directly.


Section 8.1

   Recipients should also prefer to update the HTTPS policy body before
   updating the TXT record; this ordering avoids the risk that senders,
   seeing a new TXT record, mistakenly cache the old policy from HTTPS.

It seems like this risk would be mitigated if the "id" value from
the TXT record was required to also appear in the policy body as an
identifier.  But presumably that would cause issues elsewhere, as it
is not the case in the current document.


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