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It would be helpful to have keywords for admin notifications. I.e. if the message subject or body contains "unsubscribe" that message could be forwarded/copied to the admin, to deal with people who have issues unsubscribing.
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This seems complicated to do well. It will probably be a low priority for me unless someone wants to suggest an approach and/or patch.
Perhaps in the meantime you could partially achieve this with an access rule that moderates messages with subject lines containing certain keywords. At least then only moderators would receive the admin requests and presumably the list admin would be one of them and could take care of it.