I once in a while get list mail bounced back to me as a warning that it hasn't been delevered for "N hours," N usually being 4, 8 or 12. I recently got the following advice, purporting to be effective in reducing some of the warning messages at least: > I encourage you to add a "Precedence: list" envelope header to your > mailings. Sendmail-8.6.x does not send delivery warning messages to > messages with this header line. Many sites run sendmail, and you > undoubtedly get numberous of these warning messages. These warning > messages are generated automatically when a machine is down for more > then 8 hours (in this case), but do not indicate a bad email address. Now, I want to try this out, but I can't figure out how I am supposed to add a "Precedence: list" header line (if that's what I'm supposed to do) to all outgoing list mail. I will appreciate all advice about this matter. Thanks, Taner Edis, SKEPTIC list owner