Filter cache size and filter cache timeout MTA options

LDAP lookup cache MTA options:  (integer) and    (integer)
The MTA maintains a per-process cache of tokenized (i.e., parsed but not yet evaluated) Sieve filters. This cache applies both to Sieve filters fetched from LDAP (e.g., from  and   LDAP attributes, or more precisely from whatever LDAP attributes are named by the   and  \ MTA options), and to Sieve filters directly configured into the MTA such as channel filters. The   MTA option specifies the size of this cache; the default is 500. The   option specifies the retention time, in seconds, for entries in this cache; the default is 600.

See also:
 * ldap_filter MTA Option
 * ldap_domain_attr_filter MTA Option
 * destinationfilter Option
 * Sieve filter MTA options
 * LDAP lookup cache MTA options
 * Sieve filters