Heipparallaa!
It is time for a lunch at Täffä for it is Wednesday. We'll be there at 12:30. Come out of the dull, air conditioned office and breathe some fresh air!!! :-)
This is a special DKIM test lunch. The message headers should now contain a valid DKIM signature, including messages originating from the list server (list subscription, bounces etc.). This naturally does not apply to messages to the list itself.
The real question is whether the signature check still succeeds after Mailman forwards the messages sent to the list to the list subscribers.