Murray S. Kucherawy wrote:
>> -----Original Message-----

> The only utility in revealing failed signature information is forensics.  
> That sort of debugging function doesn't need to go in a protocol 
> specification.

-1.  It is not a debugging function.

It is about security (RFC4686) and deployments considerations 
(RFC5863, see Section 7.3).

>> As the From: address is mandatory input for the signature, it may be a
>> logical step to also make it mandatory in the output?
> 
> Given the above, do we still need to?

To be more DKIM Mail Integration Consistent and Complete - yes.

See RFC5585 Figure 1 DKIM Service Architecture. The AUID is needed for 
the major CSP (Checking Signing Practice) black box flow in the DKIM 
design.

-- 
Hector Santos, CTO
http://www.santronics.com
http://santronics.blogspot.com


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