Re: [dmarc-ietf] non-mailing list use case for differing header domains

[Dave Crocker <[e-mail]>]

On 7/28/2020 2:11 PM, Autumn Tyr-Salvia wrote:
> To Todd's point, I think the answer on which policy would be applied 
> at least needs to be predictable. If one receiver chooses one policy 
> and a different receiver chooses the other policy, that is going to 
> make it significantly more complicated for complex organizations to 
> implement a DMARC p=reject or even p=quarantine policy. 

I'll suggest that this needs to be less a normative specification and 
more a best practices write-up.  First, as I've noted, receivers will do 
whatever they want.  Second is that I believe we don't yet know the 
better answers.  (And so, really, I don't mean a BCP, but rather a 
'considerations' doc.)

d/

-- 
Dave Crocker
Brandenburg InternetWorking
bbiw.net