SMTP over IPv6 : gmail classifying nearly all IPv6 mail as spam since 20140818

[Daniel Austin]

Hi,

On 22/08/2014 08:56, Laurent GUERBY wrote:
> Hi,
>
> 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
> accepted.
>
> 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 we alone with this recent experience?

gmail are still accepting IPv6 mail from my server - most recent message 
was 2 hours ago.
(they do seem to put most IPv6 transacted mail into spam folders on the 
receiving side however!)

They also reject any IPv6 transacted mail without valid reverse dns.


Thanks,

Daniel.