On 2025/05/22 10:56 AM, Frank Richter via Exim-users wrote:
What’s wrong?

Looks like a bug.  Thanks for finding this.

However, do note that your add_header will be using information that
is potentially modified by the DKIM ACL.  Confusion is possible.
Further, the ACL is run for each sig in the message - ie. possibly
more than once.  You would be adding multiple AR headers.

The more-usual place to add an AR header is in the DATA ACL, and
(opinion) there is no particular need to remove existing AR headers
*unless* they claim to have been set by your site.

--
Cheers,
  Jeremy

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