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Re: [ietf-dkim] Whither 4871bis?

2009-05-11 00:41:57


Murray S. Kucherawy wrote:
For the sake of trying to find some compromise, can we do what we did 
with the AUID/SDID debate and indicate which tags an implementation MUST 
support and which ones it MAY support?


Always a reasonable goal.  But what makes that sort of exercise challenging, 
here, is trying to keep signers and verifiers in synch about what they *both* 
support.

For example, saying MAY on l= could mean that a signer might choose to 
implementer and a validator might not.  Hence, no interoperability.

If the use of a tag by a signer, with non-support by the verifier, will prevent 
interoperability, then I think it can't be optional.

This does not negate the benefit of what you are suggesting, but it does make 
it 
more difficult.

d/

-- 

   Dave Crocker
   Brandenburg InternetWorking
   bbiw.net
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