Ldap mailhost MTA option

Direct LDAP attribute name MTA options:  (list of LDAP attribute names)
The  MTA option specifies the names of user (or group) LDAP attributes, by default. used to specify the mail host of the user (or group). When a user (or group) has no explicitly specified, see also the    MTA option which if set, specifies a domain level LDAP attribute for the MTA to use  as a default   for users without their own explicit value set.

Normally, only the host specified by   attribute may interpret (act on) a user&#x27;s delivery options; however, in the case where all such delivery options are "host-independent", as on an MTA that delivers via LMTP to "back end" message store systems, or when a user entry only contains some particular delivery options that happen to be host-independent, then processing can continue even on other hosts. This attribute is optional for groups and mailing lists. If present for a group or mailing list, it specifies that that host and only that host can expand the group or list; if absent, any host can expand the group or list. For a user for whom a  is required (such as a user with    delivery option set, when   delivery is host-dependent per ,  with no domain level    attribute value set), absence of a    attribute will cause a temporary alias expansion error: 452 4.0.0 temporary error returned by alias expansion: address (or whatever text is configured via the    MTA option), the same sort of error that would occur if an LDAP problem had occurred during the lookup of the user entry (after an LDAP lookup of the domain had already succeeded).

For some further discussion of the use of, see the Overview of Direct LDAP discussion.

For the MMP, see the analogous  option; for authentication results, see the similar   option.

See also:
 * Direct LDAP attribute name MTA options
 * delivery_options MTA Option
 * ldap_domain_attr_default_mailhost MTA Option
 * error_text_alias_temp MTA Option
 * Overview of Direct LDAP configuration
 * mailhostattrs Option
 * ldap_auth_attr_mail_host MTA Option