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

[Skeeve Stevens]

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

...Skeeve

*Skeeve Stevens - *eintellego Networks Pty Ltd
skeeve at eintellegonetworks.com ; www.eintellegonetworks.com

Phone: 1300 239 038; Cell +61 (0)414 753 383 ; skype://skeeve

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---------- Forwarded message ----------
From: Blair Harrison <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>


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 [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_errorfor
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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