[Mailman] DKIM problems with OpenStreetMap mailing lists?

[Matija Nalis]

Hi, mails from OSMF to announce at openstreetmap.org lists gets marked as
spam, because DKIM check fails with:

Authentication-Results: mx01.voyager.hr (amavisd-new);
        dkim=fail (1024-bit key) reason="fail (message has been altered)"
        header.d=osmfoundation.org

the example mail is from Dorothea Kazazi <dorothea at osmfoundation.org>
and is attached in this email to help mailing list admins to troubleshoot
the problem.

Stay safe,
Matija

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From: Dorothea Kazazi <dorothea at osmfoundation.org>
Subject: [Announce] 2020 Annual General Meeting and board election updates
Date: Tue, 3 Nov 2020 17:49:09 +0200
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