is gmail strongly penalizing IPv6 senders?

[Marco d'Itri]

On May 30, 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.
Anecdotical data that I gathered suggests that:
- I am not alone
- IPv6 senders are not penalized by default but they can easily be, much
  more easily than IPv4 senders
- as usual, there is no way to request a reputation revision[1]
- as usual, IP reputations problems can be worked around by implementing
  SPF (?) or DKIM

While I sympathize with the movement that wishes to move reputation from
IPs to domains, I expect that the result of this policy will almost
always be that IPv6-enabled customers will request to disable IPv6 for
mail.


[1] something that even Yahoo manages to do, but that I suspect that
Google is unwilling to do since it cannot be performed automatically 
with a MapReduce...

-- 
ciao,
Marco
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