WEB server

I was hoping someone had a clue on how to change the "from" address generated by a Unix web server. Currently the website sends email that generate an address like the following: www@www.mywebsite.com

How can I change that address? Your help is greatly appreciated.

You could try changing the ServerAdmin email address in httpd.conf - but I'm not sure if this is what you would be looking for or not.
What are you using as a web server (Apache?)? What version? How are these emails generated? Is www the account running Apache?