gmail.com - 550 error for ipv6/PTR ?

Wed Jan 15 07:09:01 UTC 2014

On Tue, 2014-01-14 at 19:06 -0500, Brandon Applegate wrote:
> Just saw this in a message tonight.  No idea if this is a transient error 
> or not.

Got one too for AS197422 at "Tue, 14 Jan 2014 23:59:01 +0100", resent
the mail at "Wed, 15 Jan 2014 00:03:12 +0100" and it worked so probably
transient.

Laurent

host
    gmail-smtp-in.l.google.com[2a00:1450:400c:c05::1a] said: 550-5.7.1
    [2a01:6600:80xxx] Our system has detected that this message
    550-5.7.1 does not meet IPv6 sending guidelines regarding PTR
records and
    550-5.7.1 authentication. Please review 550-5.7.1
    https://support.google.com/mail/?p=ipv6_authentication_error for
more 550
    5.7.1 information. hg12si1854476wib.39 - gsmtp (in reply to end of
DATA
    command)

Arrival-Date: Tue, 14 Jan 2014 22:59:01 +0000 (UTC)
Date: Tue, 14 Jan 2014 23:59:01 +0100

> ---
> 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=ipv6_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:
> 
> 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.
> ---
> 
> I have both of these (PTR's RR has matching AAAA, and I have SPF (but not 
> DKIM)).
> 
> I'm guessing that something on google's side is misinterpreting some data 
> or other busted logic.  I meet all the requirements laid out, and have 
> been sending mail to gmail addresses (via ipv6) since $forever.
> 
> Off-list replies are fine to minimize noise, and if there is an answer or 
> any meaningful correlation I will reply on-list.  Thanks in advance for 
> any info/feedback.
> 
> --
> Brandon Applegate - CCIE 10273
> PGP Key fingerprint:
> 830B 4802 1DD4 F4F9 63FE  B966 C0A7 189E 9EC0 3A74
> "SH1-0151.  This is the serial number, of our orbital gun."