Re: unqualified domains, was ICANN to allow commercial gTLDs

[Tony Finch <dot () dotat at>]

On 20 Jun 2011, at 02:24, Paul Vixie <vixie () isc org> wrote:
> furthermore, the internet has more in it than just the web, and i know that
> "foo@sony." will not have its RHS ("sony.") treated as a hierarchical name.

Trailing dots are not permitted on mail domains.

There has been an ongoing argument about the interaction between unqualified domains and TLDs in mail domains. RFC 2821 
said single-label mail domains were syntax errors, but this was probably an editorial mistake and RFC 5321 permits 
them. It's probably safest to assume that a single-label mail domain is a local unqualified domain which will have its 
qualifying labels appended by the message submission server, and in other contexts all bets are off.

Tony.
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