Disabling ipv6 (at least in the mail server, in outgoing direction) is probably the easiest option...
I see on most messages here DKIM-Signature headers apparently from gmail: "v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113;". These signatures are failing because of the added message footer. No sign of a DKIM-Signature for lists.bufferbloat.net. You'd need to set that up in the list MTA.

On Fri, 30 Sep 2016 at 15:42 Dave Täht <dave@taht.net> wrote:


On 9/30/16 1:02 AM, Toke Høiland-Jørgensen wrote:
> Neil Shepperd <nshepperd@gmail.com> writes:
>
>> I think I have now accumulated enough spam/nonspam classified emails
>> to make a statistically signification observation: it seems like all
>> emails classified as spam from these lists were send from ipv6:
>>
>> SPF: PASS with IP 2600:3c03:0:0:f03c:91ff:fe61:86ce
>>
>> All emails from bufferbloat.net lists are failing DKIM (because of the
>> mailing list footer breaking the DKIM signature) which might be worth
>> fixing, and failing DMARC because all mailing lists fails DMARC
>> (however google does not have a strict DMARC policy so that shouldn't
>> matter, I hope).
>>
>> By the way, it's not just you, either. I have emails from others on
>> these lists in my spam folder.
>>
>> The distinguishing factor seems to be whether the email was sent from
>> the lists.bufferbloat.net ipv6 address. Unless this address
>> corresponds to some kind of tunnel broker possibly also used by
>> spammers, I can only assume this is some kind of bug (after all, it
>> was spf validated so the address shouldn't matter at that point?).
>
> Indeed, gmail requires extra measures for IPv6:
> https://support.google.com/mail/answer/81126 (scroll down to "Additional
> guidelines for IPv6").
>
> Fixing DKIM might be worthwhile :)

But it passes the spf check?? And the reverse lookup is correct.

How about I just disable ipv6?

Have no idea why dkim doesn't work.

>
> -Toke
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