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.