On 29 Aug 2025, at 13:16, John Levine wrote:
* There will be backward compatibility with DKIM (referred to in the
room as a “transition”); there will be no flag day.
I think we agreed there will be only be backward compatibility for the
key records in the DNS, not the signatures.
The verification methods for DKIM and DKIM2 are fundamentally
different. DKIM checks signatures one at a time, while DKIM2 checks
them all as a chain.
See my reply to Dave. I do not think that was the only
backward-compatibility/transition thing we heard in the room.
pr
--
Pete Resnick https://www.episteme.net/
All connections to the world are tenuous at best
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