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

Nick Hilliard nick at
Fri Aug 22 16:24:31 CEST 2014

On 22/08/2014 15:16, Lorenzo Colitti wrote:
> Are you following the "Additional guidelines for IPv6" section of
> ?


it looks like Google is trying to enforce SPF / DKIM on ipv6 connections 
where there is no similar requirement for ipv4.  Is there a particular 
reason for this?  It's causing a lot of breakage.


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