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

Marco d'Itri md at Linux.IT
Fri Aug 22 11:26:41 CEST 2014

On Aug 22, Laurent GUERBY <laurent at> wrote:

> 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.
I just filter the gmail networks on my mail servers, you can find the 
list in the SPF record.
Google really wants everybody to switch from IP-based to domain-based 
reputation, so their systems are very very quick in penalizing IPv6 
addresses and the only solution is to use SPF and/or DKIM.
Being Google, they obviously know better than you so there is no 
remediation procedure available.

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