My guess is it your list-specific welcome msg. Try issuing
the following one-line command to: LISTSERV@your_list_host
GET listname WELCOME
-- co-owner: INFOSYS, TQM-L, CPARK-L, ERAPPA-L, JANITORS, LDBASE-L, et -L
URL:mailto:[log in to unmask] "PSUVM.bitnet RIP 12/31/96"