[168233] in North American Network Operators' Group
Re: gmail.com - 550 error for ipv6/PTR ?
daemon@ATHENA.MIT.EDU (Franck Martin)
Wed Jan 15 20:35:20 2014
From: Franck Martin <fmartin@linkedin.com>
To: Brandon Applegate <brandon@burn.net>
Date: Thu, 16 Jan 2014 01:35:02 +0000
In-Reply-To: <alpine.DEB.2.00.1401141859270.4083@orbital.burn.net>
Cc: "<nanog@nanog.org>" <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
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On Jan 14, 2014, at 4:06 PM, Brandon Applegate <brandon@burn.net> wrote:
> Just saw this in a message tonight. No idea if this is a transient =
error or not.
>=20
> ---
> host gmail-smtp-in.l.google.com =
[gmail-smtp-in.l.google.com][2607:f8b0:4002:c01::1a]
> said: 550-5.7.1 [2607:ff70:11::11] Our system has detected that =
this
> message does not 550-5.7.1 meet IPv6 sending guidelines regarding =
PTR
> records and authentication 550-5.7.1 . Please review 550-5.7.1
> https://support.google.com/mail/?p=3Dipv6_authentication_error =
[support.google.com] for more 550
> 5.7.1 information. t26si2290895yhl.255 - gsmtp (in reply to end of =
DATA
> command) ---
> That URL's relevant section says:
>=20
> Additional guidelines for IPv6
>=20
> The sending IP must have a PTR record (i.e., a reverse DNS of the =
sending IP) and it should match the IP obtained via the forward DNS =
resolution of the hostname specified in the PTR record. Otherwise, mail =
will be marked as spam or possibly rejected.
>=20
> The sending domain should pass either SPF check or DKIM check. =
Otherwise, mail might be marked as spam.
> ---
>=20
> I have both of these (PTR's RR has matching AAAA, and I have SPF (but =
not DKIM)).
>=20
It occurs to me, you may have sent a bounce, where the envelope from is =
empty, therefore SPF would work on the domain in the helo/ehlo. People =
often forget to put a SPF record there... So there may be no SPF in =
fact...
https://dmarcian.com/spf-survey/orbital.burn.net
=
http://trac.tools.ietf.org/html/draft-ietf-spfbis-4408bis-21#section-10.1.=
3
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