[142261] in North American Network Operators' Group
Re: unqualified domains, was ICANN to allow commercial gTLDs
daemon@ATHENA.MIT.EDU (Tony Finch)
Mon Jun 20 13:30:59 2011
In-Reply-To: <27712.1308533070@nsa.vix.com>
From: Tony Finch <dot@dotat.at>
Date: Mon, 20 Jun 2011 18:28:40 +0100
To: Paul Vixie <vixie@isc.org>
Cc: "nanog@nanog.org" <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On 20 Jun 2011, at 02:24, Paul Vixie <vixie@isc.org> wrote:
>=20
> furthermore, the internet has more in it than just the web, and i know tha=
t
> "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 w=
ere syntax errors, but this was probably an editorial mistake and RFC 5321 p=
ermits them. It's probably safest to assume that a single-label mail domain i=
s a local unqualified domain which will have its qualifying labels appended b=
y the message submission server, and in other contexts all bets are off.
Tony.
--
f.anthony.n.finch <dot@dotat.at> http://dotat.at/
