Installing Roundcube to work manually with OS X Server is a bit of a pain. So definitely wanted to mention that topicdesk, who brought us mailbfr and spamtrainer have now built a Roundcube package installer to take the pain out of doing so. The installer is available at http://topicdesk.com/downloads/roundcube. If you run mail on Mountain Lion Server and haven’t done anything for webmail, check it out!
The latest release of our Roundcube webmail installer for OS X 10.8.x Mountain Lion with Server 2.x is available for download on this page.
The Roundcube webmail installer for OS X 10.8.x Mountain Lion with Server 2.x will install a fully functioning and configured version of Roundcube 0.9.0 and the compiled Mcrypt libraries it depends on. It will also configure Postgres and a webapp which can be used via Server.app.