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Re: [ietf-dkim] Re: Concerns about DKIM and mailiing lists, etc.

2006-03-16 09:59:01


Arvel Hathcock wrote:
 >> Every piece of mail I've sent this morning has validated. Really.
 >
 > That's because it was all Re: and already had the subject line tag.
 > It's your lucky day.

I'm not sure that's correct. The l= in Mike's signatures takes care of the bits appended by the list to the end. The z= subject value can be used by verifiers to take care of the subject munging this list performs.

The DKIM base specification defines the z= parameter.

It does not define what to do with it.

In particular:

The verifier then simply replaces the subject text with the value from z= that was signed. That's one way of solving the mailing list subject munging problem.

This goes far beyond the specification. While it might be useful, it is really a heuristic and it is not part of the draft that is seeking standardization.

d/

--

Dave Crocker
Brandenburg InternetWorking
<http://bbiw.net>
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