[ietf-dkim] Attempted text for x=

[Hector Santos]

Steve, I posted my proposed change hopefully satisfying some other spec's
issues.

But I do have a few comments with your text:

>        Verifiers SHOULD support checking of x= values.

I think this must be a MUST.  In my view, this is risking malpractice and
product liability problems if a domain has exclusively expressed an
expiration and it is not honored by the verifier.  If there are any harm or
damages some some entity (user or domain), this is subject for action
(asking for trouble.)   I don't think I am off base with this opinion,
especially when there is such a strong DKIM charter of establish domain
responsibility and reputation stake.

>  INFORMATIVE NOTES:
>
>     2) There is no real point in including a nonsense value in
>        this tag - if the signer has no reason to include any
>        particular value then this tag is better omitted.

I don't think this information notes is necessary. I think covered it with
the 3rd note.

--
Hector Santos, Santronics Software, Inc.
http://www.santronics.com