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

[Jared Mauch]

On Fri, Aug 22, 2014 at 06:44:50PM +0200, Gert Doering wrote:
> Hi,
> 
> On Fri, Aug 22, 2014 at 12:12:57PM -0400, Jared Mauch wrote:
> > > 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.
> 
> No, PTR record is fine (and people do that for IPv4 as well).
> 
> I should have been more clear on the context - that was about requiring
> DKIM, SPF, etc. for IPv6 while not doing so for IPv4.
> 
> The I-D I was referring to is
> 
>   https://datatracker.ietf.org/doc/draft-martin-smtp-ipv6-to-ipv4-fallback/
> 
> Quote from the Introduction: "This behavior could be useful in, for 
> instance, enforcing higher requirements for Simple Mail Transfer Protocol 
> (SMTP) sessions over IPv6 than what exists on IPv4 without simply rejecting 
> the message outright."

	Sure.  Some folks want to do RPKI and other stricter methods on
IPv6 routing than IPv4 routing as the allocations are clearer and less
likely to have legacy allocations.

	SPF/DKIM aren't really new/novel things, setting up SPF isn't
hard at all.  DKIM i've not tackled yet.

	- Jared
> 
> 
> > 	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.
> 
> Agree.
> 
> Gert Doering
>         -- NetMaster
> -- 
> have you enabled IPv6 on something today...?
> 
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-- 
Jared Mauch  | pgp key available via finger from jared at puck.nether.net
clue++;      | http://puck.nether.net/~jared/  My statements are only mine.