Ldap domain attr alias MTA (and base) option

Direct LDAP attribute name MTA options:  (LDAP attribute name)
The  MTA (and  base) option specifies the name of an LDAP attribute (by default  ) used to identify domain alias entries in the directory. The attribute is present only on a domain alias entry, not on the canonical domain entry; it contains the DN of the entry for which it is an alias. It is used only in Schema 1 or in Schema 2 compatibility mode (with a DC Tree), not in Schema 2 native mode (no DC Tree).

See also:
 * Direct LDAP attribute name MTA options
 * Base options