it works on all cpanels... there are a few php scripts on the web to allow people to create their own accounts, but for the time being you can add them yourself.
just go to:
http://www.yoursite.com:2082/frontend/x/mail/addpop2.html
and create a new email account, you can put in their email address, and password. it also gives you the option to give a 'quota'.
the quota determinds how much space that email account has (in mb).
you have leave it blank for no restriction (not recommended unless you have unlimited web space)
then once the accounts have been created they can be access through this link:
http://www.yoursite.com:2095 (if using cpanel)
it then asks them to type in their username and password...
if you still dont understand, pm me and i can help you out some more...
i hope this does help though!
thanks