I want to autheticate user/password against my RDBMS database.

1. How can i go about it?

2. Do i need to update the source code and rebuild the zimbra server?

3. In the Admin Panel under domains i see Configure Authentication - but it has options only for internal/external ldap/active directory. I don't want to authenticate against any directory service internal or external; but against a user table in my RDBMS database.

Please advice. Your help is greatly appreciated.

I saw some minimal documentation available here:
http://www.zimbra.com/docs/ne/latest..._LDAP.5.1.html - but is is not very clear.