Ldap domain known attributes Option

Introduced in release: 6.0

The  MTA  (and base) option controls whether the MTA&#x27;s domain lookup LDAP queries request all domain attributes, vs. building and requesting a list of  "known" domain attributes. The default of  means to request all domain attributes; setting this option to   causes the MTA to request its hard-coded list of "known" domain attributes.

It has been claimed that the  setting can have a performance impact in some LDAP server environments.

The "known" attribute list consists of all attributes specified in the various  and similar MTA options, as well as any attributes specified in any LDAP domain map attribute substitutions. This should cover all the cases where the MTA requests domain attributes via its internal domain lookup facilities. However, in the unlikely event that other calls are made to the domain map facility, a site that has added additional domain attributes may be forced to use the default setting of  so that LDAP domain queries will return those additional, custom LDAP attribute values.

The default value is: 0

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