In article <caj4xoyecbh4ycofhzmv+a0336aifx55blvsdh-u21kkj+gr...@mail.gmail.com> 
you write:
>B) Specifying the specific Intermediary in the Intermediary Field. This
>would indicate that the users domain recognizes that the user uses the
>intermediary and by policy exempts this use even though it breaks both DKIM
>and SPF validation. The receiving domain would need to recognize some
>potential risk of malicious modifications or additions to the message.

Sounds like what I proposed several years ago:

https://tools.ietf.org/html/draft-levine-dkim-conditional-03

R's,
John
-- 
Regards,
John Levine, [email protected], Primary Perpetrator of "The Internet for Dummies",
Please consider the environment before reading this e-mail. https://jl.ly

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