[168210] in North American Network Operators' Group
Re: gmail.com - 550 error for ipv6/PTR ?
daemon@ATHENA.MIT.EDU (Franck Martin)
Wed Jan 15 13:14:44 2014
From: Franck Martin <fmartin@linkedin.com>
To: Darren Pilgrim <nanog@bitfreak.org>
Date: Wed, 15 Jan 2014 18:14:16 +0000
In-Reply-To: <52D6CDFE.3090401@bitfreak.org>
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 15, 2014, at 10:05 AM, Darren Pilgrim <nanog@bitfreak.org>
wrote:
> On 1/14/2014 4:06 PM, Brandon Applegate 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)
>=20
> I saw a number of these as well but in my case the bracketed IP =
addresses were malformed. For example:
>=20
> host gmail-smtp-in.l.google.com[2607:f8b0:4002:c01::1a] said: =
550-5.7.1 [2607:fc50:1000:1f00::2 16] Our system has detected that =
this 550-5.7.1 message does not meet IPv6 sending guidelines...
>=20
https://support.google.com/mail/answer/81126?hl=3Den#authentication
Additional guidelines for IPv6
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.
The sending domain should pass either SPF check or DKIM check. =
Otherwise, mail might be marked as spam.
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