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Date: Tue, 12 Oct 2010 10:39:29 +0100
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From: Tom Evans <tevans.uk@googlemail.com>
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Subject: Re: strange resolver behavour
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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:
> =C2=A0> Hi!
> =C2=A0>
> =C2=A0> FreeBSD 8.1-STABLE:
> =C2=A0>
> =C2=A0> # host koin-nkz.com.
> =C2=A0> koin-nkz.com has address 62.231.164.101
> =C2=A0> Host koin-nkz.com not found: 3(NXDOMAIN)
> =C2=A0>
> =C2=A0> This domain does not have MX records but NXDOMAIN seems to wrong =
return
> =C2=A0> code to me. Think about MTA that does look-up for MX first,
> =C2=A0> 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