Date: Tue, 12 Oct 2010 10:39:29 +0100 From: Tom Evans <tevans.uk@googlemail.com> To: net@freebsd.org Subject: Re: strange resolver behavour Message-ID: <AANLkTikKQO%2BjQy=2pNMngdPGaY1AO7Bqwt-Dd0sK1Ufd@mail.gmail.com> In-Reply-To: <20101012152857.X2036@sola.nimnet.asn.au> References: <4CB2AF28.30309@rdtc.ru> <20101012152857.X2036@sola.nimnet.asn.au>
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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. Cheers Tom
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