<div dir="ltr">So I got this from another list and worked with the list owner to try and figure out why mailman was bouncing it.. In this case, the admin mentioned the following. It seemed to have something to do with the IPv6 settings. This might be helpful for the list admins, and if you forward any message that you got.<div><br></div><div>...Message thread ...</div><div><br></div><div><span style="font-size:12.800000190734863px">Then the actual log message might be helpful for your, see below my</span><br style="font-size:12.800000190734863px"><span style="font-size:12.800000190734863px">sig. As far as I could see in our log files, the gmail inbound servers</span><br style="font-size:12.800000190734863px"><span style="font-size:12.800000190734863px">are not all in IPv6. Those that are not will accept messages even if</span><br style="font-size:12.800000190734863px"><span style="font-size:12.800000190734863px">the IPv6 PTR record is not correct.</span><br style="font-size:12.800000190734863px"><br style="font-size:12.800000190734863px"><br style="font-size:12.800000190734863px"><span style="font-size:12.800000190734863px">Nov 21 18:32:08 vservermail postfix/smtp[12602]: 09265141682:</span><br style="font-size:12.800000190734863px"><span style="font-size:12.800000190734863px">to=<</span><a href="mailto:jonschipp@gmail.com" style="font-size:12.800000190734863px">xxxx@gmail.com</a><span style="font-size:12.800000190734863px">>,</span><br style="font-size:12.800000190734863px"><span style="font-size:12.800000190734863px">relay=</span><a href="http://gmail-smtp-in.l.google.com/" rel="noreferrer" target="_blank" style="font-size:12.800000190734863px">gmail-smtp-in.l.google.<wbr>com</a><span style="font-size:12.800000190734863px">[2a00:1450:4013:c05::1a]:</span><wbr style="font-size:12.800000190734863px"><span style="font-size:12.800000190734863px">25,</span><br style="font-size:12.800000190734863px"><span style="font-size:12.800000190734863px">delay=8.3, delays=0.18/2.5/0.7/5, dsn=5.7.1, status=</span><span class="gmail-il" style="font-size:12.800000190734863px">bounced</span><span style="font-size:12.800000190734863px"> (host</span><br style="font-size:12.800000190734863px"><a href="http://gmail-smtp-in.l.google.com/" rel="noreferrer" target="_blank" style="font-size:12.800000190734863px">gmail-smtp-in.l.google.com</a><span style="font-size:12.800000190734863px">[</span><wbr style="font-size:12.800000190734863px"><span style="font-size:12.800000190734863px">2a00:1450:4013:c05::1a] said: 550-5.7.1</span><br style="font-size:12.800000190734863px"><span style="font-size:12.800000190734863px">[2a01:4f8:c17:4209::2] Our system has detected that this message does</span><br style="font-size:12.800000190734863px"><span style="font-size:12.800000190734863px">550-5.7.1 not meet IPv6 sending guidelines regarding PTR records and</span><br style="font-size:12.800000190734863px"><span style="font-size:12.800000190734863px">550-5.7.1 authentication. Please review 550-5.7.1</span><br style="font-size:12.800000190734863px"><a href="https://support.google.com/mail/?p=IPv6AuthError" rel="noreferrer" target="_blank" style="font-size:12.800000190734863px">https://support.google.com/<wbr>mail/?p=IPv6AuthError</a><span style="font-size:12.800000190734863px"> for more information</span><br style="font-size:12.800000190734863px"><span style="font-size:12.800000190734863px">550 5.7.1 . b197si14501470wme.159 - gsmtp (in reply to end of DATA</span><br style="font-size:12.800000190734863px"><span style="font-size:12.800000190734863px">command))</span><div class="gmail-yj6qo gmail-ajU" style="margin:2px 0px 0px;font-size:12.800000190734863px"><div id="gmail-:68u" class="gmail-ajR" tabindex="0"><img class="gmail-ajT" src="https://ssl.gstatic.com/ui/v1/icons/mail/images/cleardot.gif" style="opacity: 0.3;"></div></div><div class="gmail-adL" style="font-size:12.800000190734863px"><br></div><div class="gmail-HOEnZb gmail-adL" style="font-size:12.800000190734863px"><div class="gmail-im">2016-11-22 17:20 GMT+01:00 Jeremy Hoel:<br>> Thank you! I had another list have this problem and the admin never got back<br>> to me.. Nice to have a possible answer for next time.<br>><br>> Cheers!<br>><br>><br>> On Nov 22, 2016 2:15 AM, "ADMIN" wrote:<br>>><br>>> IPv6 reverse DNS was not properly set, this is now corrected. I have<br>>> re-enabled your account.<br>>><br>>> Thanks for letting me know!<br>>><br>>><br>>> 2016-11-22 10:57 GMT+01:00 "ADMIN":<br>>> > thx for the <span class="gmail-il">bounce</span>. I've checked the logs, and it looks like the mail<br>>> > list server is doing some IPv6 stuff incorrectly. We'll investigate...<br>>> > I keep you posted.</div></div></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Feb 14, 2017 at 9:46 AM, Trevor Woerner <span dir="ltr"><<a href="mailto:twoerner@gmail.com" target="_blank">twoerner@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Is there a way to whitelist google? Can't we assume google isn't a<br>
rogue domain? This is the second or third time in the last couple<br>
months.<br>
<br>
<br>
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