> Hello !
>
> Per curiosity, do you have an idea of what the issue was ?
I don't know.
My best guess is that they were changing something in their DKIM/ARC
validation systems, and something didn't go as expected (which then
required a few hours to repair), but I don't know for certain because
I'm not an insider on their systems.
Did you or any of your users/customers encounter the same problem?
> Thanks
> [image: Alexandre Schmit-Baverel]
>
> [image: Generic]
> <https://sign.positivegroup.com/l/Z3ptNWwzUGJRTzJMU2xyb01ydElGQT09-VzNGNG5oU1pWYjZRMTVQMUxBZ2xJZz09>
> [image: linkedin]
> <https://sign.positivegroup.com/l/Z3ptNWwzUGJRTzJMU2xyb01ydElGQT09-eFZMaExNZWZGQjMvaVVJaDArTTl6Zz09>
> [image:
> youtube]
> <https://sign.positivegroup.com/l/Z3ptNWwzUGJRTzJMU2xyb01ydElGQT09-VHU5ZDFDM3h6QXJ6Qm9jSUVjb2Ftdz09>
>
> *Alexandre Schmit-Baverel*
> Responsable Délivrabilité Groupe
> www.positivegroup.com
> <https://sign.positivegroup.com/l/Z3ptNWwzUGJRTzJMU2xyb01ydElGQT09-VzNGNG5oU1pWYjZRMTVQMUxBZ2xJZz09>
>
> [image: Sarbacane is becoming Positive User]
> <https://sign.positivegroup.com/l/Z3ptNWwzUGJRTzJMU2xyb01ydElGQT09-a1RCUlYzaUFUM1hkQTZoV29vMXBjUT09-czdtcUNKTFozcTJGbWpNaUZESmk4UT09>
>
>
>
> On Fri, Jun 19, 2026 at 6:48PM 'Randolf Richardson, Postmaster via mailop'
> via PGF - Délivrabilité <[email protected]> wrote:
>
> > Update: GMail's staff resolved this this problem within an hour
> > after I posted this, and they are correctly validating DKIM/ARC
> > signatures again.
> >
> > > For the past three hours, GMail has been faililng to correctly
> > > validate DKIM/ARC signatures. Nothing changed in our configurations
> > > before this problem started, and remains the same now.
> > >
> > > SMTP headers added by GMail look like this:
> > >
> > > Authentication-Results: mx.google.com;
> > > dkim=neutral (bad version) [email protected]
> > > header.s=mail header.b=aPYfxSQd;
> > > arc=fail (dns record malformed);
> > > spf=pass (google.com: domain of [email protected]
> > > designates 65.110.3.188 as permitted sender)
> > > [email protected];
> > > dmarc=pass (p=REJECT sp=REJECT dis=NONE)
> > > header.from=inter-corporate.com
> > >
> > > Our DMARC policy is also set to "p=reject" in all-lower-case
> > > letters, and not the way Google is recording it. As long as it
> > > works, I don't really care, but it's not working because it's
> > > accepting or quarantining instead of rejecting.
> > >
> > > Other non-GMail systems validating DKIM/ARC signatures, which
> > > further-confirms that our DNS records are not malformed. Updating
> > > the SOA serial number in the hopes that GMail will ignore any DNS
> > > cache corruption on their end didn't help after TTL ran out.
> > >
> > > If you get such GMail errors today, don't waste any time trying to
> > > troubleshoot problems on your end if other non-GMail systems are
> > > validating DKIM/ARC signatures correctly.
> > >
> > > Hopefully Google will get this problem sorted soon, because
> > > intermittently tossing messages into spam folders that they're
> > > failing to validate DKIM/ARC for is causing problems for end-users.
> >
> > --
> > Postmaster - [email protected]
> > Randolf Richardson, CNA - [email protected]
> > Inter-Corporate Computer & Network Services, Inc.
> > Vancouver, Beautiful British Columbia, Canada
> > https://www.inter-corporate.com/
> >
> >
> > _______________________________________________
> > mailop mailing list
> > [email protected]
> > https://list.mailop.org/listinfo/mailop
> >
>
--
Postmaster - [email protected]
Randolf Richardson, CNA - [email protected]
Inter-Corporate Computer & Network Services, Inc.
Vancouver, Beautiful British Columbia, Canada
https://www.inter-corporate.com/
_______________________________________________
mailop mailing list
[email protected]
https://list.mailop.org/listinfo/mailop
