Ldap source channel MTA option

Direct LDAP attribute name MTA options:  (LDAP attribute name)
(New in MS 6.3-0.15) The   MTA option specifies the name of a user or group LDAP attribute which will be used to store the source channel for messages submitted by this user. There is no default; (no pre-defined LDAP attribute for this purpose).

The value of the LDAP attribute named by   sets a source channel to which to "switch" for messages submitted by the user,  if     is set on the current source channel. If the user LDAP attribute is present, it will override any domain-level setting made via the LDAP attribute named by the  MTA option.

See also:
 * Direct LDAP attribute name MTA options
 * userswitchchannel Option
 * ldap_domain_attr_source_channel MTA Option