The directory or user store in the messaging architecture stores user information such as ID, password, and email address. The software of many messaging servers utilizes the user store mechanism of the host, such as /etc/hosts on the Solaris OE. Others, such as the Sun ONE Messaging Server, utilize a directory or LDAP service to store and access user information.
The Sun ONE Messaging Server ships with and requires a fully compliant LDAP directory that contains directory objects specific to the Sun ONE Messaging Server software. These directory objects extend the default Internet Engineering Task Force (IETF) schema with additional attributes. A complete guide to the Sun ONE Messaging Schema is part of the existing documentation.