Sorry looks like I forgot to actually specify the option in the config that is blocking that server:
Global Settings -> MTA tab -> Client must greet with a fully qualified hostname (reject_non_fqdn_hostname)
As for an LDAP ACL... I don't think so but you can look. The LDAP root password can be found using this command:
Code:
zmlocalconfig -s ldap_root_password
And the root DN I use to connect is
Code:
uid=zimbra,cn=admins,cn=zimbra