The MMP can cache results of user searches. The LdapCacheSize parameter defines the number of cache entries; LdapCacheTTL defines the length of time the entries are preserved in seconds. Higher values will increase performance, but will result in delayed recognition of LDAP data changes, for example password changes. Lower values will reduce performance of the MMP, but will result in faster recognition of LDAP data changes.

The default LdapCacheSize is 10,000; the default LdapCacheTTL is 900. These parameters do not apply to SMTP proxy.