You can't force your customers, but you have to tell them what will happen
to their emails.

You can point them to this document:
https://www.m3aawg.org/sites/maawg/files/news/M3AAWG_Inbound_IPv6_Policy_Issues-2014-09.pdf

and also
https://engineering.linkedin.com/email/sending-and-receiving-emails-over-ipv6

On Thu, Apr 14, 2016 at 8:26 AM, Thomas Wilhelm <thomas.wilh...@inexio.net>
wrote:

> Hi Brandon,
>
> thank you for your answer.
>
> Our outgoing IPv6-addresses are:
>
> 2a01:5c0:63:10[0-8]::1/56 and
> 2a01:5c0:63:[1-8]::1/56
>
> Our main domains are: inexio.net and myquix.de These domains are under
> our control, so we are going to enable DKIM for both and SPF for
> inexio.net. SPF is already enabled for myquix.de.
>
> In addition to our private customers, we have about 1.000 business
> customers, who also send mails from their domains using our outgoing
> mailserver as a smarthost.
> We can't force them to setup SPF or DKIM for their domains.
>
> I've just enabled maildelivery via IPv6 now for 20% of our mails.
> As soon as I have an example for actual deliviery problems I'm going to
> send you these source domains.
>
> Are there any general improvements we can do ?
>
> best regards,
>
> Thomas
>
> ------------------------------
> *Von: *"Brandon Long" <bl...@google.com>
> *An: *"Franck Martin" <fmar...@linkedin.com>
> *CC: *"Tony Finch" <d...@dotat.at>, "mailop" <mailop@mailop.org>, "Thomas
> Wilhelm" <thomas.wilh...@inexio.net>
> *Gesendet: *Mittwoch, 13. April 2016 20:56:31
> *Betreff: *Re: [mailop] Gmail Blacklisting
>
> We don't just run reputation on IP addresses, the spammer killed the
> reputation of any associated domains and such.  Your domain is recovering,
> but it can take up to 30 days to fully recover.... sometimes longer if
> people don't mark your mail as not spam.
> Though, that's only for the domain you're posting from, without details
> not much more I can go on.
>
> Brandon
>
> On Wed, Apr 13, 2016 at 10:48 AM, Franck Martin via mailop <
> mailop@mailop.org> wrote:
>
>> And it is not only to Google, many other mail receivers requires SPF or
>> DKIM over IPv6.
>> And if you set up a mail receiver with IPv6, do these requirements too,
>> it is an industry best practice (cf M3AAWG.org).
>>
>> On Wed, Apr 13, 2016 at 2:59 AM, Tony Finch <d...@dotat.at> wrote:
>>
>>> Thomas Wilhelm <thomas.wilh...@inexio.net> wrote:
>>> >
>>> > Does anybody have a hint for us, how to fix this problem?
>>>
>>> To send mail to Google over v6 you have to have SPF, DKIM, reverse DNS,
>>> everything set up to the best anti-spam standards.
>>>
>>> Tony.
>>> --
>>> f.anthony.n.finch  <d...@dotat.at>  http://dotat.at/  -  I xn--zr8h
>>> punycode
>>> Southeast Iceland: Northeasterly 5 or 6 becoming variable 3 or 4, then
>>> cyclonic 5 to 7. Moderate or rough, becoming slight or moderate for a
>>> time.
>>> Showers. Good.
>>>
>>> _______________________________________________
>>> mailop mailing list
>>> mailop@mailop.org
>>> https://chilli.nosignal.org/cgi-bin/mailman/listinfo/mailop
>>>
>>
>>
>> _______________________________________________
>> mailop mailing list
>> mailop@mailop.org
>> https://chilli.nosignal.org/cgi-bin/mailman/listinfo/mailop
>>
>>
>
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