Yes: because the mail system at mainstreet.opm.gov is NOT compliant with the RFCs. It should have sent it to [log in to unmask] Feel free to forward that bounce to that Marist address indicating that your recent distribution bounced and that the list-owner needs to delete the offending userid from the subscriber list. If they can't figure out, someone here will be glad to help them. /Pete Weiss, Penn State