[AusNOG] Fwd: [nznog] heads up.. gmail now checking ipv6 rdns

[Seamus Ryan]

I thought they started doing this about six months ago? At least that's what i found... Good on em i say. Its an uphill battle trying to get people to set their environment up to even a low standard. If a giant like google forces everyone to do things properly, it could certainly help in reducing the spams on the internets slightly. Dare they do it for ipv4??

Seamus
________________________________
From: Skeeve Stevens<mailto:skeeve+ausnog at eintellegonetworks.com>
Sent: ‎26/‎01/‎2014 12:53 PM
To: ausnog at ausnog.net<mailto:ausnog at ausnog.net>
Subject: [AusNOG] Fwd: [nznog] heads up.. gmail now checking ipv6 rdns

Important to note.... noticed by our friends on NZNOG.

...Skeeve

Skeeve Stevens - eintellego Networks Pty Ltd
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---------- Forwarded message ----------
From: Blair Harrison <nznog at jedi.school.nz<mailto:nznog at jedi.school.nz>>
Date: Sat, Jan 25, 2014 at 11:43 AM
Subject: [nznog] heads up.. gmail now checking ipv6 rdns
To: NZNOG <nznog at list.waikato.ac.nz<mailto:nznog at list.waikato.ac.nz>>


Hi Folks,

Just got caught out with this on my personal box today. It looks as if Gmail is now checking RDNS on any inbound ipv6 smtp connections and rejecting with 500 error if it doesn't match.


example fail -

SMTP error from remote mail server after end of data:
    host gmail-smtp-in.l.google.com<http://gmail-smtp-in.l.google.com> [2a00:1450:4008:c01::1a]:
    550-5.7.1 [2402:6000:1000:x::x] Our system has detected that this message does
    550-5.7.1 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. oq6si4802967bkb.182 - gsmtp

So if you have ipv6 enabled on your mail servers and haven't yet set some RDNS for them.. now is the time.

Cheers,
Blair


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