From mboxrd@z Thu Jan  1 00:00:00 1970
From: Matthew Hall <mhall@mhcomputing.net>
Subject: Re: Any chance someone could fix the SPF records for
 this mailing list?
Date: Wed, 3 Jun 2015 20:09:45 -0700
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 <20150604030757.GA16737@mhcomputing.net>
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On Wed, Jun 03, 2015 at 08:07:57PM -0700, Matthew Hall wrote:
> Hello,
> 
> I can confirm your claims. When I enabled IPv6 on my mail server Google began 
> dropping or severely graylisting 100% of the mail until the IPv6 subnet was 
> added to the SPF record. This needs to get fixed or the IPv6 outbound SMTP has 
> to be disabled or Google users will lose tons of mails from the list.
> 
> Matthew.

See also:

https://support.google.com/mail/answer/81126
https://support.google.com/mail/answer/81126?p=ipv6_authentication_error&rd=1#authentication

There is a specific section regarding IPv6.

Matthew.