opentoe - 2013-04-07

I installed Webmin 1.620. It installs sendmail for use for email. When I'm in the terminal doing some work I'll get a message come up "You have new mail". I know it is trying send email to the root user cause I can go into Webmin and view root's email inbox. What I need to know how to do is where do I configure ROOT's email address so it can send a real email address out and not to the internal one. I looked all through each settings in Webmin and nothing there regarding setting up email addresss. Thanks,.