Ldap_domain_timeout MTA (and base) option
LDAP lookup cache MTA options:
ldap_domain_timeout option (available at both base and MTA levels) controls the retention time (in seconds) for entries in the domain map cache. The default is -900; as the value used is the absolute value of the
ldap_domain_timeout setting, this corresponds to 15 minutes. If setting
ldap_domain_timeout explicitly, set it to a positive value so that the MTA can detect that it has indeed been intentionally set.