SMTP over IPv6 : gmail classifying nearly all IPv6 mail as spam since 20140818
lorenzo at google.com
Fri Aug 22 16:16:04 CEST 2014
On Fri, Aug 22, 2014 at 12:56 AM, Laurent GUERBY <laurent at guerby.net> wrote:
> We've been running SMTP over IPv6 with postfix successfully for over a
> year and since 20140818 gmail.com IPv6 MX started to classify most IPv6
> sourced emails sent from our machine to @gmail.com as spam. The exact
> same message sent using IPv4 within one minute of the IPv6 bounce is
> As there's no way to reach google mailops we had to remove IPv6 from our
> mail machines and go back to IPv4 only for mail, which is sad.
Are you following the "Additional guidelines for IPv6" section of
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