I tried to use Zimbra with authentication to an external LDAP directory with Auto-Provisioning.
The auto-provisioning (with eager) did work well but it creates only the mailbox.
It doesn't delete the mailbox if the user has been deleted at the LDAP directory.
Another problem is if i change the password in zimbra webmail - the password doesn't change in LDAP.

Is there a solution to synchronize zimbra and ldap?