https://bugs.exim.org/show_bug.cgi?id=2706
--- Comment #2 from Simon Arlott <bugzilla.exim.simon@???> ---
I've just tested Exim 4.90 with "+Received", "=Received" and "Received" and it
behaves as expected when checking with Mail::DKIM::Verifier (and amending
headers to fit the signature).
The first two are over-signing the Received: header so it is inevitable that
the signature will fail to validate after another one is added.
Exim does DKIM validation at SMTP time while reading the incoming message so it
doesn't have an additional Received: header yet. With "+Received", SpamAssassin
will fail validation because this happens after another Received: header is
added.
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