Probably using some form of VALIDATE=. BUT BEFORE YOU DO THAT, please consider that this solution might be worse that the disease i.e., forged signoffs are a rarity (so far) and probably should not result in altering ALL subscribers' interactions to signoff or other listserv subscription alterations. What might appear at first blush to be a spoof, might in fact be the attempt by a network or system administrator to adjust an address for "local" reasons. - -- co-owner INFOSYS, TQM-L, CPARK-L, ERAPPA-L, JANITORS, LDBASE-L, et -L [log in to unmask] "Who said you could use MY Internet?!" +1 814 863 1843 31 Shields Bldg. -- Penn State -- University Park, PA 16802-1202 USA