I've decided to close the ArM5 mailing list. I created it just after the Ars Magica Fifth Edition came out, when a lot of the discussion on the existing mailing list was about the differences between Fourth Edition and Fifth Edition. ArM5 was a place for discussing the new edition on its own terms.
A year later, the fan community has generally embraced Fifth Edition, and the extra mailing list is redundant, and gets very little use; most people use the BerkList or the Atlas forums. It served its purpose, and now it's time to put it to sleep.