I have no idea whether Listserv changes its IP address, though it sounds nuts to me: but we had McAfee here for some years and never had the slightest trouble. If this is a school address, it's the network administrator's responsibility to maintain the staff's access to listservs. I recently had this problem with another spam filter at a university ISP, regarding a list for university teachers I administer, and the staff there was told something similar, until they raised hell about it. Go over the network administrator's head: she's not doing her job. -- Russ Russell Hunt Department of English St. Thomas University http://www.stu.ca/~hunt/