https://bugs.exim.org/show_bug.cgi?id=2706
--- Comment #4 from Simon Arlott <bugzilla.exim.simon@???> ---
DKIM-Signature: is not a trace header field according to RFC6376 5.4
Signers may sign non-existent headers to prevent additional headers being
added.
Both the signer and verifier are working correctly. If you over-sign the
Received: header then no more can be added without invalidating the signature.
If you want to interpret the Received: headers to imply the state of the
message at each hop then you can do that prior to verification but it is not
part of the standard.
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