I think RC is missing a GUI admin panel. I just installed & tested Atmail Webmail
Webmail Client - Groupware, Webmail, PHP powered, Ajax interface and MySQL backend. The software is very impressive and what I really love is being able to login from the login page to an admin console which offers a dashbaord and allows you to manage users.
Managing users is my biggest complaint in RC. Having to remove a user from the mail server then manually having to login to MySQL and remove all there settings too sucks. With Atmail, I can simply click one button to delete one user or mutiple from webmail and MySQL backend. Very impressive and I love the dashboard statitics.
Just a suggestion...