Let's say I have domain.com that matches my last name. If I am John I could have . If I have a sister named juliette, I could set up for her. How would she have access to webmail? Thanks!
If you install a mail server, you could have such a setup by simply creating the users "john" and "juliette" on the server, so they will receive e-mail there. Webmail is the second step, which you solve by installing a web server and then installing a webmail script like SquirrelMail on it.
if cpanel, then goto cpanel, and click webmail. or look for alternatives Google Apps and Ms Live Services for domain
All of your replies within the server admin forums, are post count gaining replies with no real support at all.