On Fri, Aug 22, 2014 at 7:24 AM, Nick Hilliard <n...@foobar.org> wrote:
> On 22/08/2014 15:16, Lorenzo Colitti wrote: > >> Are you following the "Additional guidelines for IPv6" section of >> https://support.google.com/mail/answer/81126 ? >> > > it looks like Google is trying to enforce SPF / DKIM on ipv6 connections > where there is no similar requirement for ipv4. Is there a particular > reason for this? It's causing a lot of breakage. I believe the answer has to do with the fact that a lot of IPv6 email is spam and the fact that if you can't/won't do what's suggested in the "additional guidelines for IPv6" then you can always continue to use IPv4. >From what I've heard it's somewhat of a consensus position among large email operators on what to do for IPv6 SMTP inbound. Note that from the text it sounds like SPF / DKIM is not strictly required, but it looks like a PTR record is a hard requirement.