On Jan 24, 2009, at 6:01 PM, John C Klensin wrote:
--On Sunday, January 25, 2009 12:30 +1100 Mark Andrews <[email protected]> wrote:Dotless hostnames are in the local namespace and can *never* be made to work *reliably* in a global context. Note the use of non-heirachical names is undoing the changes introduced by RFC 921 and will introduce problems RFC 921 was trying to remove/prevent.Yeah. Since I have not been able to find a single hint in ICANN's new TLD plans that those TLDs would be restricted to delegation-only uses, tell it to ICANN. Or tell it to whomever is supposed to be supplying adult supervision to ICANN :-( Not an SMTP problem. SMTP requires FQDNs, without exception, and does not permit single-component ones.
5321 explicitly says otherwise ("A domain name (or often just a "domain") consists of one or more components, separated by dots if more than one appears. In the case of a top-level domain used by itself in an email address, a single string is used without any dots.").
The whole point of this thread is to dig a little deeper into why that decision was made and what the implications are, I think.
Cheers, Steve
