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Web Hosting and Cloud Computing Control Panels
I currently use just the Wemail portion of Atmail. I created a new virtual server called "mail.pacyworld.com", and I have Apache listen for any domain aliases with "mail.*". Then I install Atmail normally.
This setup allows my users to access email in the form of http://mail.clientdomain.com.
I don't think using the server version of Atmail would be possible. Atmail maintains it's own user database in MySQL, uses a separate configuration file for it's settings, and maintains it's own user mail directories separately from the operating system. It also uses Exim & Courier which I believe does not work with Webmin/Virtualmin.