In order to facilitate netwide signoff (or query) without flooding the net with messages, why not try the following: Have each backbone LISTSERV keep a list of subscribers to lists anywhere at nodes "under their jurisdiction" (i.e. for which they are the nearest listserv. They would need to be primed initially, and then for every subscription modification a record would be sent by whatever listserv maintained the list to the closest backbone. They might be batched (say once a day). That way, one would only need to ask the closest backbone to find out what subscriptions you had anywhere. Victor Miller -- IBM Research