I wanted to kind of bring this thread back out again.
We are in the process of creating a second Joomla site in our organization but this time we only want one group of users be able to log in. All of the users will be Zimbra users also and will be included in one email distribution list.
Is it possible to use that list name to authenticate against? If they are a part of that list, then let them in, if not then no.
dj