On Thu, Aug 20, 2020 at 4:56 PM Dotzero <dotz...@gmail.com> wrote: > This is why I proposed a tag that would have a value consisting of the > authorized intermediary domain. It would only be valid for that message. > Because the tag is signed separately from the rest of the message, it > should survive even if the intermediary modifies other parts of the > message. If the intermediary DKIM signs the modified message with their own > signature, that provides some assurance to the receiver.
You mean like https://tools.ietf.org/html/draft-levine-dkim-conditional-00? I'm pretty sure that got implemented too, but I can't recall now if it ever shipped. -MSK
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