Yes indeed, sendmail can be configured to authenticate outgoing mail. I got it working several months ago and have since forgotten some of the details. What I found most helpful was the following document: http://www.sendmail.org/~ca/email/auth.html Depending on what kind of authentication you are doing, you can bypass some of the steps. For example, in my case I was only interested in the client side of things which would apply to most of us who are connecting to our ISP's mail server. Another helpful source is the Sendmail-Address-Rewrite mini-HOWTO. If anyone is interested I can send them a copy of my sendmail.mc file which encorporates the changes necessary to implement both documents. Chris
