I'm doing some exploration of mail routing using LDAP.

The Email and LDAP chapter of O'Reilly's LDAP System Administration book is available free in PDF format. It covers how to set up e-mail clients to access LDAP servers for address book information and also how to configure three popular MTAs to use LDAP for map and routing information.

The chapter assumes that one is working with OpenLDAP. As we will be using the Sun ONE Directory Server, some things need to change. Particularly for the Sendmail routing information, the object class we should use is already built in to the DS: mailRecipient. This object class does not define the attribute mailLocalAddress, but I believe we can simply use the mail attribute and put the same value in it (it should be the canonical e-mail address of the user, in either case).

The routing support may come in handy when (if?) we move seminary users to receiving mail on the seminary servers.