Apart from being a requirement in many projects, here are the benefits of using an OPENDS/LDAP for Joomla authentication:
2. Configure the plugins with your OPENDS/LDAP data. This is the tricky part, which could make you spend manhours and frustrate you a lot if you are not sure about the parameters.
The parameters shown above are for OPENDS and should be ok for the majority of the systems and should allow you to connect using your email credentials