Hi - Yes - I've archived/shodowed the entire Yahoo! neonixie-l group at Groups.io - they would have sent emails to the Yahoo! group as part of this and that would them be forwarded to the Google group as the Google group is subscribed to the Yahoo! one...
Hope that make it clear! Irritating, isn't it. I try to sort out stuff behind the scenes, then something goes a bit pair-shaped... :)
Don't worry about it - the message is genuine, but just ignore it - no-one can port to the Groups.io shadow anyway...
