Date: Wed, 13 Oct 2010 01:39:30 +1100 (EST) From: Ian Smith <smithi@nimnet.asn.au> To: Tom Evans <tevans.uk@googlemail.com> Cc: dougb@freebsd.org, net@freebsd.org Subject: Re: strange resolver behavour Message-ID: <20101013010757.N2036@sola.nimnet.asn.au> In-Reply-To: <AANLkTikKQO%2BjQy=2pNMngdPGaY1AO7Bqwt-Dd0sK1Ufd@mail.gmail.com> References: <4CB2AF28.30309@rdtc.ru> <20101012152857.X2036@sola.nimnet.asn.au> <AANLkTikKQO%2BjQy=2pNMngdPGaY1AO7Bqwt-Dd0sK1Ufd@mail.gmail.com>
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This message is in MIME format. The first part should be readable text, while the remaining parts are likely unreadable without MIME-aware tools. --0-1241133225-1286894370=:2036 Content-Type: TEXT/PLAIN; charset=ISO-8859-1 Content-Transfer-Encoding: 8BIT On Tue, 12 Oct 2010, Tom Evans wrote: > On Tue, Oct 12, 2010 at 10:05 AM, Ian Smith <smithi@nimnet.asn.au> wrote: > > On Mon, 11 Oct 2010, Eugene Grosbein wrote: > > > Hi! > > > > > > FreeBSD 8.1-STABLE: > > > > > > # host koin-nkz.com. > > > koin-nkz.com has address 62.231.164.101 > > > Host koin-nkz.com not found: 3(NXDOMAIN) > > > > > > This domain does not have MX records but NXDOMAIN seems to wrong return > > > code to me. Think about MTA that does look-up for MX first, > > > obtains NXDOMAIN and rejects mail. > > > > If a domain has no MX server, how's an MTA supposed to do mail with it? > > > > The same way as has been done since they invented the MX record type - > if no MX record exists, fallback to an A record. See RFC 5321, section > 5.1. Well thanks Tom, I did - but which A record? Taking the '5.3. Master file example' in RFC1035, what is the A response for 'ISI.EDU.' where the domain itself has no specific A RR? Would it be that of VENERA.ISI.EDU, or that of the first A listed, ie A.ISI.EDU? And in either case - assuming a domain without any MX RR as above - why would that A response be expected to address a mail server? cc Doug for obvious reasons, ie I'm likely missing something obvious :) cheers, Ian (BTW I'd begun to reply off-list, as neither your private copy nor your reply to the list indicated cc'ing the other .. googlemail quaintness?) --0-1241133225-1286894370=:2036--
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