We have our central mail servers specified as MX hosts for our LISTSERV server. We run MIMEDefang and McAfee uvscan on the central mail servers, and MD is configured to discard any message which uvscan identifies as a mass-mail virus carrier message. In the last 2+ weeks, our central mail servers have discarded nearly 900,000 mass-mail virus carrier messages. -- Paul Russell Senior Systems Administrator University of Notre Dame