is gmail strongly penalizing IPv6 senders?

[Lorenzo Colitti]

On Thu, May 30, 2013 at 11:46 PM, Marco d'Itri <md at linux.it> wrote:

> I have noticed in the last few days that mail sent to gmail from a
> significant number of our servers (both shared hosting / mail relays and
> dedicated servers of our customers) with IPv6 connectivity is delivered
> to the spam folder.
>

I've asked internally, and in many cases this appears to be due to server
operators not properly configuring reverse DNS for their IPv6 addresses. Do
you know if that is the case here?
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