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SettingExplanation
Realm A realm is a database of users with a specific name. Users can belong to multiple realms, but any given resource is protected by a single realm. For example, the administration and configuration resources are protected by the "admin" realm, whereas mail is setup by default to use another realm, named "mail".
User Name The name of a valid existing user to attach zero or more aliases to. It may not contain a colon ":".
Alias An alias to use for an existing user name. It must not be the same as any existing user name in this realm.

It may not contain a colon ":"

Common uses for aliases include aliasing "PostMaster" and "WebMaster" e-Mail ids to a single user name. This means the system administrator only needs to examine one mailbox.

Add an Alias Add a new alias to an existing user name.
Delete an Alias Delete an existing alias.
Find Users Aliased Lists all user names that have aliases defined.
Find Aliases of User Lists all valid aliases for a given user name.
Verify User Alias Verifies that the given alias is defined for the specified user.