No. DKIM signatures were designed to work when emails are forwarded. I run a couple of Linux related mailing lists, and the DKIM signature continues to validate specified headers and the body of the email when forwarded or resent via mailing lists. Dealing with that quirk happened a decade ago, and it is why most mailing lists no longer add headers or footers to emails with instructions on how to unsubscribe.
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Wait, wouldn't setting gmail.com to p=reject break anyone using legacy email-forwarding setups and mailing lists?
No. DKIM signatures were designed to work when emails are forwarded. I run a couple of Linux related mailing lists, and the DKIM signature continues to validate specified headers and the body of the email when forwarded or resent via mailing lists. Dealing with that quirk happened a decade ago, and it is why most mailing lists no longer add headers or footers to emails with instructions on how to unsubscribe.
Nice, thanks for the explanation. I haven't run a mailing list in over ten years, so I'm afraid I'm a bit out of date on the setup.