Viktor Dukhovni:
> On Thu, Oct 10, 2013 at 01:58:45AM +0200, Dominik George wrote:
>
> > > Confirmed, Postfix looks at the answer section only. Claims to
> > > the contrary are based on false speculation.
> >
> > Hmm, that leads us to the original question:
> >
> > Why does postfix sometimes not find the AAAA record for any given MX?
>
> It does not fail to find it. It just uses IPv4. See:
>
> http://www.postfix.org/postconf.5.html#smtp_address_preference
>
> The documentation for
>
> http://www.postfix.org/postconf.5.html#inet_protocols
>
> is sadly I believe out of date. The sentence:
>
> When both IPv4 and IPv6 support are enabled, the Postfix SMTP
> client will attempt to connect via IPv6 before attempting to
> use IPv4.
>
> is no longer accurate. That is only true when
>
> smtp_address_preference = ipv6
>
> The correct description is:
>
> When both IPv4 and IPv6 support are enabled, the Postfix SMTP
> client, for Postfix versions prior to 2.8, will attempt to
> connect via IPv6 before attempting to use IPv4. Starting
> with 2.8 protocol preference is controlled via the new
> smtp_address_preference parameter.
I make that:
When both IPv4 and IPv6 support are enabled, the Postfix SMTP
client will choose the protocol as specified with the
smtp_address_preference parameter. Postfix versions before 2.8
attempt to connect via IPv6 before attempting to use IPv4.
Text should describe current behavior before historical behavior.
Wietse
