Sorry "This proposes modifying DKIM1
<https://www.rfc-editor.org/rfc/rfc6376.html> to make use of algebra to
reverse the changes." was poorly phrased.  DKIM1 signatures are not
modified, nor when to sign.  However, what I meant to say is that
verification is changed to allow a DKIM2-aware receiver to verify using
RFC6376 and to also use DKIM1-SIGNATURE. If it likes the answer from
DKIM1-SIGNATURE,
it may elect to use that result instead of RFC6376.
-Wei

On Thu, Sep 18, 2025 at 11:52 AM John Levine <[email protected]> wrote:

> It appears that Wei Chuang  <[email protected]> said:
> >This proposes modifying DKIM1 <
> https://www.rfc-editor.org/rfc/rfc6376.html>
> >to make use of algebra to reverse the changes.
>
> I think that's a non-starter.  If people are going to change their DKIM
> software,
> why would they implement mutant DKIM1 rather than DKIM2?
>
> It's hard to see how we can do better than telling people to sign in
> parallel.
>
> R's,
> John
>
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