You cannot do that. The concept of acknowledgement via MAIL or MSG was to confirm that the message reached everyone, so all the peers bother you. With acknowledgement set to NO you only get a one-line message from the first server. By the way, could the 2-3 sites which run a local LSTSRV-L redistribution for archival purposes kindly edit the header to read "Ack= None" rather than "Ack= No", so that posters get strictly no message from these sites? Thanks. Eric