It's simple. If you are asked to join, you have not been added to the group, and hence cannot unsubscribe (because you weren't subscribed in the first place, see next paragraph). The original inquisitor just replied to the Bulbophile group's "Welcome" email and CC'd the PBS list, much to your confusion, in order to ask a question to both groups. Perhaps in the future it would be best to write to each list separately to avoid confusion, particularly since the recent discussion of spam has everyone on guard. Travis Owen Rogue River, OR http://www.amateuranthecologist.com/ http://www.pacificbulbsociety.org/