"it depends" . do you believe him? . is he really subscribing and then posting? . how active is you list esp. via new subscribers? I've done some number of the following on lists that I operate with a high-level of success (that not 100%), via list definition keywords: * SUBSCRIBE= OPEN,CONFIRM * SEND= PRIVATE * DEFAULT-OPTIONS= REVIEW * FILTER= *@*some_hi_level_domain Issued LISTSERV(R) commands: QUIET DEL listname Luserid@bad_node QUIET SET listname NOREVIEW FOR good_guy/gak@good_node emailed postmaster@bad_node or abuse@bad_node about Luserid's spam. /Pete Weiss at Penn State