Ok. I got it to where I didn't have to create everyones account in Joomla first but just authentic against the Zimbra LDAP. Here are the settings I used.
Host servername
Port 389
LDAP V3 Yes
Negotiate TLS No
Follow referrals N
Authorization Method Bind and Search
Base DN ou=people,dc=domain,dc=domain,dc=domain
Search String uid=[search]
Users DN
Connect username
Connect password
Map: Full Name displayName
Map: E-mail mail
Map: User ID uid
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