Re: gmail.com - 550 error for ipv6/PTR ?

[Franck Martin <fmartin () linkedin com>]

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.
>
> ---
> 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)).

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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