<div dir="ltr"><div class="gmail_extra"><div class="gmail_quote">On Fri, Aug 22, 2014 at 12:56 AM, Laurent GUERBY <span dir="ltr"><<a href="mailto:laurent@guerby.net" target="_blank">laurent@guerby.net</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">We've been running SMTP over IPv6 with postfix successfully for over a<br>
year and since 20140818 <a href="http://gmail.com" target="_blank">gmail.com</a> IPv6 MX started to classify most IPv6<br>
sourced emails sent from our machine to @<a href="http://gmail.com" target="_blank">gmail.com</a> as spam. The exact<br>
same message sent using IPv4 within one minute of the IPv6 bounce is<br>
accepted.<br>
<br>
As there's no way to reach google mailops we had to remove IPv6 from our<br>
mail machines and go back to IPv4 only for mail, which is sad.<br></blockquote><div><br></div><div>Are you following the "Additional guidelines for IPv6" section of <a href="https://support.google.com/mail/answer/81126">https://support.google.com/mail/answer/81126</a> ? </div>
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