Ldap host alias list Option

Updated in release: 7.0.5.36

The  option is available at the base and MTA levels. (The MTA normally uses the base level value, unless its own MTA level override value has been set.) The Message Store uses the base level option value. In legacy configuration, the  must be used for this purpose.

The value of  sets additional host names to be interpreted as the "local host" for certain interpretation purposes.

Use with base
 The  Base option allows setting a list of host names that will be recognized as synonyms for the host name. It corresponds to the configutil parameter  in legacy configuration. The value takes a comma-separated list of up to 40 host aliases; each host alias may be at most 256 characters long; the total length of the entire list is limited to 1024 characters. (In iMS 5.2, the limits were smaller: at most 20 host aliases and each host alias at most 252 characters long.)

In Unified Configuration, this value is used by the Message Store when interpreting the  attribute to determine whether a user&#x27;s mailboxes can be accessed locally. In legacy configuration, the  must be used for this purpose.

Unless  has been set (thereby overriding the  ), the    base option also affects MTA operation. The  value(s) are used by the MTA when deciding whether a domain&#x27;s   value(s) or a user&#x27;s   value is "local"  (this MTA itself). That is, once an LDAP lookup of a domain or user occurs, this option&#x27;s value(s) affect the interpretation of the result of the LDAP lookup.

See also:
 * Base options

Use with mta
 The  MTA option specifies local host aliases for LDAP lookup result interpretation purposes. Specifying this option at MTA level overrides, for MTA purposes, the  base option (  configutil parameter in legacy configuration), thereby allowing the MTA to recognize a different set of such aliases than the Message Store  recognizes. Neither the base nor MTA level option has a default value; if the base level option is set, it is used by the MTA unless the MTA level option has been explicitly set in which case the MTA uses the MTA level option&#x27;s value.

The  value takes a comma-separated list of up to 40 host aliases; each host alias may be at most 256 characters long; the total length of the entire list is limited to 1024 characters. (In iMS 5.2, the limits were smaller: at most 20 host aliases and each host alias at most 252 characters long.) New in Messaging Server 7.0.5.36, the MTA supports wild-carded host name values.

The   value(s) are used by the MTA when deciding whether a domain&#x27;s   value(s) or a user&#x27;s   value is "local"  (this MTA itself). That is, once an LDAP lookup of a domain or user occurs, this option&#x27;s value(s) affect the interpretation of the result of the LDAP lookup.

An important use of the  is in email configurations spanning multiple data centers, with routing via SMTP between data centers and delivery LMTP within each data center. In such a setup the mailbox  MTA option clause  is set for LMTP but is left as  mailhost-dependent, rather than as in a  typical configuration being marked with "#" to be mailhost-independent. Then all the LMTP hosts for the local data center are listed in the  MTA option value on each MTA. Note that as the number of stores becomes large it&#x27;s preferable to use a naming convention for stores along with a wildcard  value, to avoid configuration churn as stores are added or deleted.

See also:
 * Direct LDAP attribute interpretation MTA options
 * Configutil override MTA options
 * ldap_mailhost MTA Option
 * ldap_domain_attr_routing_hosts MTA Option

See also:
 * Direct LDAP attribute interpretation MTA options
 * Configutil override MTA options
 * Base options
 * ldap_mailhost MTA Option
 * ldap_domain_attr_routing_hosts MTA Option