I've been stashing everything into X-DKIM2-Info: headers from all my signers, 
verifiers, and Message-Instance generators.  I'm happy to do an informational 
draft on this.

Bron.

On Tue, Sep 15, 2026, at 10:29, Steve Atkins wrote:
> Some DKIM software has the ability to stash details about the software - 
> product name, release version, job ID - being used to sign or validate a 
> message in a header. “X-DKIM” and “DKIM-Filter” are two I recall seeing.
> 
> Do we encourage (or discourage) something like that for DKIM2, to help with 
> identifying interop problems?
> 
> Cheers,
> Steve
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--
  Bron Gondwana, CEO, Fastmail Pty Ltd / Fastmail US LLC
  [email protected]
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