Paul, that was me. The problem eventually disappeared, but a new problem, called "Routing loop detected" appeared. It seems that people can forward their mail to another address, which creates more problems when the post bounces. Some of the original problem bounces occurred when User1 forwarded their mail to an account on Compuserve, which then bounced the posts back to me, but their Compuserve address isn't on my list. Anita Cohen-Williams; Reference Services; Hayden Library Arizona State University, Tempe, AZ 85287-1006 PHONE: (602) 965-4579 FAX: (602) 965-9169 INTERNET: [log in to unmask] Owner: HISTARCH