https://bugs.exim.org/show_bug.cgi?id=2706
--- Comment #1 from Jeremy Harris <jgh146exb@???> ---
Possibly those other MTAs are running a validation check on a message *after*
they have added their own Received: header to it? I can't think of a reason
that Exim might be treating Received: specially on the signing side.
I should point out that RFC 6376, in "5.4.1. Recommended Signature Content"
recommends agains signing Received. That doesn't mean there isn't a bug,
either here or in the comparisons you made.
You may be able to see the headers being selectied for signing using Exim's
debug facilities.
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