This looks like a cleaner version of my forwarding token proposal.

>> You're constraining it to use by a specific, very small set of domains,
>> and only for a limited time.
>
>Then again, let's note that this double-signed mail is going to show up
>at some receivers that don't know about DKIM-delegate.

Right.  So if you don't want people using unforwarded weak signatures
for reputation management, you need to put something into them so that
old clients don't accept them as signatures and ignore the t= tag.
Either call them something other than DKIM-Signature, or do a version
bump to v=2.

R's,
John



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