DoNAI is the general form of identity that we use for ARPA2. It is either a fully qualified domain name, or a Network Access Identifer (representing a person).
email@example.com a user under a domain or host name
@examples.comis an anonymous user at a domain or host name
example.comis a domain or host name
The first and second forms are formally defined as Network Access Identifier, the third form is what we add to distinguish a domain name or host name.
NEWS: We may be able to revert completely to the NAI form when we
realise that access from a domain or host name will usually be limited
to a particular service, which we may annotate before the
We should verify if that is good enough for all situations.
Note that the anonymous user is visually distinct from the domain or host name.