Thanks, Jacob, your comments clarified things. The current setting is: Auto-delete= Yes,Semi-Auto,Delay(8),Max(2) I currently receive copies of the errors that presumably are not formatted in such a way that LISTSERV knows what to do with them. - Kathy M. Jacob Haller wrote: > You may wish to temporarily set your mailing list to > > Auto-Delete= Yes,Semi-Auto,... > > (I assume your current setting is Yes,Full-Auto); LISTSERV will then > forward bounces from addresses not subscribed to the mailing list to > the listowner for inspection. That should clarify what the bounces > related to the "ghost" addresses are.