[ietf-dkim] Clarification: Section 5.4.6

[Michael Thomas]

Damon wrote:

>   6.   Practices and Expectations MUST be presented as an information
>        service from the sender to be consumed as an added factor to the
>        receiver's local policy.  In particular a Practice or
>        Expectation MUST NOT specify any particular disposition stance
>        that the receiver should follow.
>
> Should the last sentence say: "Expectation MUST NOT specify any
> particular disposition stance that the receiver MUST follow."?
>
> In my opinion, if the Expectation is set, it is stating a suggested
> usage. Or in other words, what the receiver should follow.

I think that this is a question of whether the "should" (or "MUST" in
yours) is actually normative. I don't think it is. It might read better as:

  "In particular, a Practice or Expectation MUST NOT mandate any
    disposition stance on the receiver."

       Mike