Re: ipv6 PTR record; was: Re: Fwd: Bounce action notification
On Sat, Jan 18, 2014 at 01:39:14PM +0100, Dave Neary wrote:
On 01/15/2014 09:38 PM, Karsten Wade wrote:
> I'm the one with the Linode access, but I'm unclear what/if I can
> do anything?
Ewoud can help you out - we need to add a PTR record for the IPv6
address of linode01.ovirt.org to the DNS so that reverse DNS resolves
correctly.
The issue is that gmail and other email providers check whether the MX
(in this case, linode01.ovirt.org) has a valid IPv6 DNS entry, and
score you down if you don't.
Actually this is a valid case we haven't mentioned. There is no forward
DNS either. That means we should also create that.
The alternative is to disable IPv6 for the time being. Since
smtp_address_preference[1] is 2.8+ and we run 2.6.6, we can only use
inet_protocols[2]. Currently we don't listen on the outgoing IPv6 anyway
so I don't think this has any negative impact. If there's no objections,
I'm proposing we change inet_protocols from all to ipv4 this evening.
[1]: http://www.postfix.org/postconf.5.html#smtp_address_preference
[2]: http://www.postfix.org/postconf.5.html#inet_protocols
When we've added the forward and reverse DNS, we can enable it again and
properly support IPv6.
> Also, I'd much prefer that we finish the task of moving off
the
> Linode host. When is that happening?
Are there plans to move the management of the DNS zone off Linode also?
Reverse DNS is tied to your IP space and since we don't have PI-space,
Linode owns the IP we use. That means when we move away from linode, the
reverse DNS management of that IP becomes irrelevant.