is gmail strongly penalizing IPv6 senders?

[Dan Wing]

On May 30, 2013, at 5:01 PM, Lorenzo Colitti <lorenzo at google.com> wrote:

> On Thu, May 30, 2013 at 11:46 PM, Marco d'Itri <md at linux.it> wrote:
> I have noticed in the last few days that mail sent to gmail from a
> significant number of our servers (both shared hosting / mail relays and
> dedicated servers of our customers) with IPv6 connectivity is delivered
> to the spam folder.
> 
> I've asked internally, and in many cases this appears to be due to server operators not properly configuring reverse DNS for their IPv6 addresses. Do you know if that is the case here?

I was wondering if IPv6 privacy addresses could be causing the problem (which are less likely to have reverse DNS records), but I see both FreeBSD and several Linux flavors have IPv6 privacy addresses turned off, so that wouldn't be the cause.

-d


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