We have an intranet site that our users login to with basic authentication using their ldap user creds via mod_auth_ldap. The intranet site is running on a different machine that is running Apache. Zimbra is using external ldap auth using the same creds as the intranet uses.

I want them to be able to click a link from the intranet site to login to Zimbra from the intranet site and have Zimbra auto-login the user. I can have the link that they click magically include their username but I don't know how to do anything else. Anybody have ideas?