How does one determine which of many hundreds of userids subscribed to a list is responsible for forwarding email to a now-non-existant userid@host which bears no relation at all to any of the subscribers? If I forward my mail off into oblivion (say, forward to "[log in to unmask]"), how is a listowner ever to find the source of this bounce? Is there a way to coerce LISTSERV into individually addressing mail for a list temporarily so the headers come back with a real destination userid instead of "multiple recipients of list blahblah"? --Brick