Alright ! Not at all, I'm just curious in case it even happen's to me.
Have a nice week end ! [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 Sun, Jun 21, 2026 at 5:00 AM Randolf Richardson, Postmaster < [email protected]> wrote: > > 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/ > > >
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