Domain uplevel MTA option

Subdomain handling in domain lookups
The   MTA option affects how domain names are searched for and used in direct LDAP mode. The option takes a bit-encoded integer argument, where each bit controls a particular aspect of domain name searching/usage; see below. The default value is 0.

Bit 0 is the least significant bit.

See also the    MTA option for specifying the name of a domain-level LDAP attribute which allows some domain-level override of the MTA-wide setting of.

See also:
 * Direct LDAP domain lookup MTA options
 * ldap_domain_attr_uplevel MTA Option
 * ldap_default_domain MTA Option
 * ldap_equivalence_addresses MTA Option
 * ldap_alias_addresses MTA Option
 * reverse_url MTA Option
 * Address reversal