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<br><br><div class="gmail_quote">---------- Forwarded message ----------<br>From: <b class="gmail_sendername">Blair Harrison</b> <span dir="ltr"><<a href="mailto:nznog@jedi.school.nz">nznog@jedi.school.nz</a>></span><br>
Date: Sat, Jan 25, 2014 at 11:43 AM<br>Subject: [nznog] heads up.. gmail now checking ipv6 rdns<br>To: NZNOG <<a href="mailto:nznog@list.waikato.ac.nz">nznog@list.waikato.ac.nz</a>><br><br><br><div dir="ltr"><div><div>
Hi Folks,<br><br></div>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.<br>
<br><br></div>example fail - <br><br> SMTP error from remote mail server after end of data:<br>
host <a href="http://gmail-smtp-in.l.google.com" target="_blank">gmail-smtp-in.l.google.com</a> [2a00:1450:4008:c01::1a]:<br>
550-5.7.1 [2402:6000:1000:x::x] Our system has detected that this message does<br>
550-5.7.1 not meet IPv6 sending guidelines regarding PTR records and<br>
550-5.7.1 authentication. Please review<br>
550-5.7.1 <a href="https://support.google.com/mail/?p=ipv6_authentication_error" target="_blank">https://support.google.com/mail/?p=ipv6_authentication_error</a> for more<br>
550 5.7.1 information. oq6si4802967bkb.182 - gsmtp<br>
<br><div>So if you have ipv6 enabled on your mail servers and haven't yet set some RDNS for them.. now is the time.<br><br></div><div>Cheers,<br>Blair<br><br></div></div>
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