On May 30, 2013, at 5:01 PM, Lorenzo Colitti <[email protected]> wrote:
> On Thu, May 30, 2013 at 11:46 PM, Marco d'Itri <[email protected]> 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
