SMTP over IPv6 : gmail classifying nearly all IPv6 mail as spam since 20140818

Jared Mauch jared at
Fri Aug 22 18:12:57 CEST 2014

On Fri, Aug 22, 2014 at 05:05:22PM +0200, Gert Doering wrote:
> Hi,
> On Fri, Aug 22, 2014 at 07:32:41AM -0700, Lorenzo Colitti wrote:
> > >>From what I've heard it's somewhat of a consensus position among large
> > email operators on what to do for IPv6 SMTP inbound.
> Well... some think it's a good idea, and there is an IETF draft, which
> largely failed to get support.
> I think it's a very bad idea to have stronger requirements on IPv6 mail 
> than on IPv4, as it is yet another obstacle to IPv6 deployment - but 
> maybe that's just me, and I have a slighly different focus than most
> religious anti-spammers.

	I think requiring a PTR isn't that high of a bar.  If you're on
a host without support of doing a v6 PTR, you likely aren't on good
hosting location and should relay via a host that does have a v6 PTR.

	I don't care if my phone/ipad/desktop have a PTR, and they
all relay via hosts that are dual-stacked, and require smtp-auth to relay.
They shouldn't be connecting directly to google.

	- Jared

Jared Mauch  | pgp key available via finger from jared at
clue++;      |  My statements are only mine.

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