Is there any CMS that allows me to do this?

Hello, i brought a hosting for 1 GB and it comes with cpanel (linux hosting) php, apache etc... and i want to give free emails to my site visitors to promote my site.

I can manually add email address from cpanel and mail the the login details. Rightnow i made a request form for an email which comes to my mailbox and then manually add the accounts and the mail them back. Can i make something like signup page and automatically add the email account. (something like yahoo, hotmail etc...) Is there any CMS that allows me to do this?

Right now for checking mails i have to type .domain.com:2095 or www.domain.com/webmail (redirected) and give the full email address ie user@domain.com to login can this be simplified?

Please help me