Use the Java Enterprise System 2005Q4 Installer to install Messaging Server.
For installation instructions, see the Sun Java Enterprise System 2005Q4 Installation Guide for UNIX.
Next, you must configure Messaging Server by:
Running the Directory Server Preparation Tool, comm_dssetup.pl .
Running the Messaging Server configuration program.
For configuration instructions, see the Sun Java System Messaging Server 6 2005Q4 Administration Guide