I just saw the aftermath of someone attempting to "unsend" a message to a LISTSERV list and all the bounce back of "message recall failure" back to the list. What a mess. I have now added a CONTENT FILTER for the "message recall failure", but now am wondering if there is a way to inhibit this kind of Exchange command being distributed by LISTSERV. Any other things I should be filtering from Exchange? Thanks for your help, -Rich -- Richard A. Helmke Internet: [log in to unmask] Assoc Prof, Computer Science [log in to unmask] System Manager, Technical Services Voice: 708-209-3221 Concordia Administrative Information Systems Fax: 708-209-3177 River Forest, IL 60305-1499 Bugs come in through open Windows.