On Tue, May 5, 2015 at 1:24 PM, John R Levine <[email protected]> wrote:

> John’s proposal changes DKIM but also requires additional changes in DMARC
>> to respect the changes that were made to DKIM when doing alignment (the
>> @fs=domain is more or less the same as the Original-To below). ...
>>
>
> It's not supposed to.  The decision about whether a DKIM signature that
> depends on a chained signature is valid is supposed to happen entirely
> within the updated DKIM module.  DMARC just uses that result.  I assume the
> DKIM module is able to look at all of the DKIM signatures on a message and
> report back which ones are valid.
>

Other chatter on this list suggests that not all DKIM verifier
implementations work that way, unfortunately.

-MSK
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