Ldap username MTA option

LDAP bind and connect MTA options:  (ldap-dn)
The  MTA option specifies the DN under which to bind for LDAP queries. This option, if set, overrides for MTA purposes the base-level   option (in legacy configuration, the   configutil parameter).

See also:
 * LDAP bind and connect MTA options
 * ugldapbinddn Option
 * Configutil override MTA options