Hi all. I had a similar issue with a customer: turned out that the "script" generating the email message wasn't adding a Message-ID header. Had the server add the missing header before dkim signing, issue solved.
Sometimes the devil is on the details ... On Wed, May 6, 2026 at 12:26 PM Jonathan Loriaux via mailop < [email protected]> wrote: > Hi David, > > To properly identify the problem, you need to analyze the SMTP headers of > a successfully delivered email (to a different destination, for example). > > Feel free to contact me privately if you need help. > > Jonathan > P.s. : N'hésitez pas à vous inscrire à nos newsletters : > https://www.badsender.com/newsletter/inscription/ > > > *-- Jonathan Loriaux* > > CRM Consultant and > Co-director of Badsender > > 07.62.33.33.47 <+33762333347> > > [email protected] > > badsender.com <https://www.badsender.com> > > lepatron.email <https://www.lepatron.email> > > Facebook <https://www.facebook.com/Badsender/> Twitter > <https://twitter.com/jloriaux> Linkedin > <https://www.linkedin.com/in/jonathanloriaux/> > > Book a meeting with me <https://zeeg.me/jloriaux/short> > > > > > On 5/6/26 08:57, Hello Maildrop via mailop wrote: > > Hello, > > One of my customer, hosted at Google workspace, have recurrent problem > when sending to some addresses at live.fr or hotmail.com > > The messages bounce back indicating a DKIM failure, however the messages > sended are well signed. Delivery to other destinations enforcing DKIM/DMARC > does not cause any problems (Gmail, Orange) > > 550 5.7.515 Access denied, sending domain MISSEGLE.COM doesn't meet the > required authentication level. The sender's domain in the 5322.From address > doesn't meet the authentication requirements defined for the sender. To > learn how to fix this see: > https://go.microsoft.com/fwlink/p/?linkid=2319303 Spf= Pass , Dkim= Fail > , DMARC= Pass [AM8P189MB1234.EURP189.PROD.OUTLOOK.COM > 2026-05-06T05:21:48.296Z 08DEAAD6427386FD] [ > DU2PR04CA0024.eurprd04.prod.outlook.com 2026-05-06T05:21:48.305Z > 08DEAAEBE699717D] [DB1PEPF000509FE.eurprd03.prod.outlook.com > 2026-05-06T05:21:48.308Z 08DEA716CB8BDD0A] > > I can't identify the cause of this problem, do you have any ideas? > > *TOUREL David* > > *MAILDROP* > 17 ch de la Longuié - 81210 MONTFA > > Tél : 05 63 51 07 79 > Retrouvez-nous sur Twitter @maildrop_fr <https://twitter.com/maildrop_fr> > > _______________________________________________ > mailop mailing [email protected]https://list.mailop.org/listinfo/mailop > > _______________________________________________ > mailop mailing list > [email protected] > https://list.mailop.org/listinfo/mailop > -- -- Paulo Azevedo
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