I don't think it is the SENDER field that LISTSERV is trying to SUBSCRIBE, just the FROM field, had the SENDER not been POSTMASTER userid! POSTMASTER is a no-no for a SENDER when your list's keyword is: * FILTER= ALSO,POSTMAST*@* Obviously this person's POSTMASTER is not sending e-mail and is configured incorrectly, or else all that advice we have been giving over several years about filter POSTMASTER would have resulted in a deluge of bounced subscribes. The SENDER, when different from the FROM:, is supposed to be the software process e.g., NETNEWS, a LISTSERV list name. POSTMASTER is supposed to be a human being, not a process. LISTSERV did the "right" thing. -- co-owner: INFOSYS, TQM-L, CPARK-L, ERAPPA-L, JANITORS, LDBASE-L, et -L URL:mailto:[log in to unmask] "I've been cybertagged :-("