The "Ldap lookup timeout" option specifies the timeout for LDAP database lookups. This option sets the "ldap_lookup_timeout" postfix variable.
The "Ldap search base" option specifies the LDAP database to search. This option sets the "ldap_search_base" postfix variable.
The "Ldap server host" option specifies the LDAP server hostname. This option sets the "ldap_server_host" postfix variable.