https://bugs.exim.org/show_bug.cgi?id=2947
--- Comment #5 from Simon Arlott <bugzilla.exim.simon@???> ---
Your emails are missing a Message-ID but this is included in the signature.
Neither of the headers validates successfully unless the Message-ID that both
Gmail and Microsoft added is removed.
The body fails to validate in the Gmail case but they may have reformatted it.
The message is omitted for the Microsoft version.
You need to enable submission mode on the email coming from your MUA clients so
that it will add a Message-ID automatically:
https://www.exim.org/exim-html-4.95/exim-html-current/doc/html/spec_html/ch-message_processing.html
If you test again, the original message (as sent) would be useful even if it
lacks the DKIM signature.
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