DKIM-Signature: r=y
Reading https://bugzilla.gnome.org/show_bug.cgi?id=796602 I conclude that there is no implicit way to handle the case when mailman 2 or 3 modifies the message, breaking DKIM-Signature validation and the latter contains r=y; defined in RFC 6651.
This leads to sending messages about broken signatures, which emails distract and have no added value (investigating why this happened is lost time, the reason is not in the signer or validator).
- When mailman 2 or 3 modifies a message in a way that breaks DKIM-Signature containing r=y; , remove the latter tag from the header.