On 4/1/2015 8:22 PM, John Levine wrote:
> DKIM-Signature: v=2; d=example.com; ...
> DaveKIM-Signature: v=1; d=example.com; ...
>
> In this particular case, the incompatibility is a new kind of "must
> handle" tag suggested by Ned Freed with the new rule that if a
> verifier doesn't understand it, the verification fails.
This handling of unrecognized tags is another change from existing DKIM:
"3.6.1. Textual Representation
...
The
current valid tags are described below. Other tags MAY be present
and MUST be ignored by any implementation that does not understand
them."
So receipt of a message signed in the new form will likely produce an
incorrect signature validation, since
(1) the new tag's semantics won't be applied and
(2) the new rule for unrecognized tags won't be applied.
d/
--
Dave Crocker
Brandenburg InternetWorking
bbiw.net
_______________________________________________
dmarc mailing list
[email protected]
https://www.ietf.org/mailman/listinfo/dmarc
