When the system finds the DC tree domain node with the appropriate name, it checks to see if it's an alias, index node, or the canonical domain. The canonical DC tree domain has the same name as the Organization tree containing the user and group records. This is the official name of the domain. For Messaging Server, this canonical domain name determines the name of the domain in the message store hierarchy where users' inboxes are located. The system retrieves the DN for the corresponding Organization tree domain from the inetDomainBaseDN attribute found in the DC tree canonical domain.
If the DC tree domain does not have the same name as the corresponding Organization tree domain, it is not the canonical domain. It is an alias, or an index node, and must carry either the inetCanonicalDomainName attribute or the aliasedObjectName attribute.
When a DC tree domain node carries the aliasedObjectName attribute, it is an alias that contains no routing or access control information. The attribute value is used to find the DC tree canonical domain node where the routing and access control information for this alias resides.
When a DC tree domain node carries the inetCanonicalDomainName attribute, it is an index node. This type of alias contains its own routing and access control information, which can be different than the information carried on the DC tree canonical domain. The system uses the value of the inetCanonicalDomainName attribute to find the name of the Organization tree domain node, under which user and group records for this index node alias reside.
If neither the aliasedObjectName attribute, nor the inetCanonicalDomainName attribute is present in the DC tree domain, then the system assumes it is the canonical domain and uses the value of the inetDomainBaseDN attribute to find the Organization tree domain.