On May 19, 2015 2:05:18 AM EDT, "Murray S. Kucherawy" <superu...@gmail.com> 
wrote:
>On Mon, May 18, 2015 at 10:56 PM, Terry Zink
><tz...@exchange.microsoft.com>
>wrote:
>
>>  Thanks, this is useful.
>>
>> What would the Authentication-Results header look like? Presumably 3
>> results for DKIM (dkim=fail, dkim=pass, dkim=pass)? And what about
>DMARC?
>> Show one result or two? Or maybe something like
>dmarc=conditionalpass?
>>
>Three DKIM results, one DMARC "pass" result.  The idea is that DKIM
>returns
>a "pass" for an aligned conditional signature, which satisfies the DKIM
>algorithm, so long as there's also a passing signature from the "cd"
>domain.
>
>Is there any use in making a distinction to your acceptance/routing of
>messages to know it was based on a conditional signature versus an
>original
>author signature?

I would think you'd have to. There's a replay risk that's unique to this type 
of signature, so I think treating them the same would be a naive approach. 

Scott K

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