Yes, that is a limitation. However, that's a DMARC problem, not a DKIM problem. 
(Also, arguably not a huge problem, but again, that discussion is probably more 
appropriate for the DMARC list, and is not relevant to the DKIM discussion 
here).

- Phillip

> On Aug 22, 2025, at 12:07 AM, John R. Levine <[email protected]> wrote:
> 
> On Thu, 21 Aug 2025, Murray S. Kucherawy wrote:
>>> However, we've found that there are other policy decisions we want to
>>> apply to messages based on DKIM/DMARC status. For technical, security, and
>>> liability reasons, simply getting the DKIM/DMARC status from the
>>> Authentication-Results is not sufficient for this.
>> 
>> Can you explain why?  This is exactly what A-R was made to do.
> 
> It also occurs to me that the MUA can't directly check the SPF result because 
> it doesn't know what IP the message was sent from.  It could look at the 
> Received haders, but if it's going to believe them, why wouldn't it also 
> believe the A-R?
> 
> R's,
> John

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