Howdy, I have been charged with the mission of coming to terms with Return-Path: and Procmail/Smartlist. In the interest of protecting my Smartlist-based mailing lists from virii, I have deployed a Procmail-based solution and it works great!;) The solution also offers the opportunity to inform the Sender and Recipient of the infected email that appropriate action has been taken on their behalf, and offers them an opportunity to respond to such action. The trouble is, this notification system ultimately relies on the Return-Path: of the Sender of the infected email. How does Smartlist handle the Return-Path:? It seems to be absent in tmp.request. Does Smartlist intercept via the pipe in /etc/aliases the inbound email before Sendmail attaches the Return-Path: header field? Thanks, --Paul -- William J. Broad: "The crux... is that the vast majority of the mass of the universe seems to be missing."