Url result cache size and url result cache timeout MTA options

LDAP lookup cache MTA options:  (integer) and    (integer)
LDAP lookups done from callouts in rewrite rules  or  mapping tables may be cached; that is to say,   lookups may be cached. The  MTA option controls the size of this cache; the default is 10000. The  MTA option controls the timeout, in seconds, for entries in this cache; the default is 600.

See also:
 * Rewrite LDAP query URL substitutions
 * Mapping entry templates
 * LDAP lookup cache MTA options
 * Miscellaneous mapping table MTA options