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List:       postfix-users
Subject:    Re: rejected mail: Domain not found - but it is?
From:       wietse () porcupine ! org (Wietse Venema)
Date:       2005-01-31 21:29:03
Message-ID: 20050131212903.25638BC179 () spike ! porcupine ! org
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Magnus Bäck:
> On Monday, January 31, 2005 at 22:03 CET,
>      David Cary Hart <PostfixMTA@TQMcube.com> wrote:
> 
> > On Tue, 2005-02-01 at 09:54 +1300, Simon Buchanan wrote:
> >
> > > Thats all well and good, but foodnews.co.nz is a registered and
> > > valid domain name. I did some checking and a whois shows the domain
> > > as registerd, but a host lookup of the domain points to the fact
> > > that the ISP has not got a host record setup on their name
> > > servers...
> >
> > There is no A record
> 
> True, but there is no requirement for that. There must however be an A
> record *or* an MX record (inclusive or).

A little known fact is that for a long time, reject_unknown_mumble_domain
has also done AAAA lookups on systems libraries that support it,
even when the system itself isn't IPv6 connected. This is because
the system may be connected via an IPv6 connected mail relay.

	Wietse

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