[arch-general] ML is being sent to Spam by Gmail

[Maarten de Vries]

On 8 June 2016 at 10:55, Florian Pritz via arch-general <
arch-general at archlinux.org> wrote:

> On 08.06.2016 06:26, Eli Schwartz via arch-general wrote:
> > dkim header remarks indicate either failed or missing dkim sigs for
> > those messages.
>
> That's weird. For me the signatures very just fine. Could you show me
> the exact error you get (assuming there is one)?
>
> Maybe also run the full mail (source, including headers) through
> `opendkim-testmsg` (part of the opendkim package)? If there is no error,
> the mail verifies fine.
>
> Also missing DKIM signatures are not our fault and FWIW a missing
> signature should not cause mails to go to spam. An invalid signature
> also shouldn't unless there is a DMARC policy for that domain that
> states so. archlinux.org currently doesn't publish a DMARC policy so the
> default of letting everything through applies.
>
> We do change the From address of any mail that uses DMARC though and
> resign the mail with our key so that signatures for those mails are
> valid. Since we change the From address, the DMARC policy of the
> original sender no longer matters.
>
> I don't know if gmail provides any information as to why they classify a
> specific mail as spam, but if they do, please show me. If they do not,
> please send me all the headers of one mail that has been delivered to
> spam so I can check them for possible problems.
>

​Gmail imposes more strict checks on email coming in over IPv6, with​ the
rationale that IPv6 enabled machines are more modern and thus should be
configured properly for newer verification techniques. Of course, for a
mailinglist this does not fly since it does not generate the messages
itself. See also [1], specifically "Additional guidelines for IPv6".

So... A stupid but possibly pragmatic approach is to use IPv4 when relaying
email to gmail.

[1] https://support.google.com/mail/answer/81126