Yes, as of last night. Again. Same as last time (January?) - SNDS reporting clean and green, no issues, Microsoft says there is no block on my IP. Hopefully the same remedy works as last time - open a ticket, get an automated response that there’s nothing to fix, respond again with logs/data and hope to get a human response who can fix it.
Fill out a ticket here, unless you have some other support channel (sounds like you might): https://olcsupport.office.com/ > On May 6, 2026, at 5:49 PM, Areeb via mailop <[email protected]> wrote: > > Hi all, > > Is anyone else running into Microsoft blocks (S3150, Ratelimiting) at the > moment? We’ve suddenly started seeing entire IP range blocks across two of > our ranges, including customers using dedicated IPs. > > Microsoft support has been particularly unhelpful. Nothing abnormal in our > logs. > > Areeb Majeed > Co-founder, > Maileroo > maileroo.com <https://maileroo.com/> [email protected] > <mailto:[email protected]> > <https://facebook.com/maileroo> > <https://www.linkedin.com/company/maileroo/> > <https://twitter.com/maileroodotcom> > > > Maileroo Group Pty Ltd | Level 10, 440 Collins Street, Melbourne VIC 3000 >> On 6/05/2026 11:49:38 PM, [email protected] >> <[email protected]> wrote: >> >> Send mailop mailing list submissions to >> [email protected] >> >> To subscribe or unsubscribe via the World Wide Web, visit >> https://list.mailop.org/listinfo/mailop >> or, via email, send a message with subject or body 'help' to >> [email protected] >> >> You can reach the person managing the list at >> [email protected] >> >> When replying, please edit your Subject line so it is more specific >> than "Re: Contents of mailop digest..." >> >> >> Today's Topics: >> >> 1. Re: mailop Digest, Vol 70, Issue 8 (Thomas Walter) >> 2. Re: Suspect DKIM failure to Microsoft destination >> (Jonathan Loriaux) >> 3. Re: Suspect DKIM failure to Microsoft destination (Paulo Azevedo) >> >> >> ---------------------------------------------------------------------- >> >> Message: 1 >> Date: Wed, 6 May 2026 12:56:00 +0200 >> From: Thomas Walter >> To: [email protected] >> Subject: Re: [mailop] mailop Digest, Vol 70, Issue 8 >> Message-ID: >> Content-Type: text/plain; charset="utf-8" >> >> Thanks Areeb, >> >> On 06.05.26 11:34, Areeb via mailop wrote: >> > Having the same issue, they are sending the email through a no reply >> > email address. You need to change the address in the To field >> > from [email protected] >> > to [email protected]. >> >> This just confirmed, I'm stupid. The original mail from Microsoft tells >> me in red >> >> ----- >> *This is an automated message from an unmonitored mailbox. To ensure >> your reply reaches us, please include >> [email protected] in the “To” field when responding. >> ----- >> >> But of course if you are in a hurry, you don't read the red important >> letters and just hit reply, because you know you have to escalate the >> ticket anyway. >> >> Regards, >> Thomas Walter >> >> -- >> Thomas Walter >> Datenverarbeitungszentrale >> >> FH Münster >> - University of Applied Sciences - >> Corrensstr. 25, Raum B 112 >> 48149 Münster >> >> Tel: +49 251 83 64 908 >> Fax: +49 251 83 64 910 >> www.fh-muenster.de/dvz/ >> >> -------------- next part -------------- >> A non-text attachment was scrubbed... >> Name: smime.p7s >> Type: application/pkcs7-signature >> Size: 4819 bytes >> Desc: S/MIME Cryptographic Signature >> URL: >> >> ------------------------------ >> >> Message: 2 >> Date: Wed, 6 May 2026 09:17:00 +0200 >> From: Jonathan Loriaux >> To: [email protected] >> Subject: Re: [mailop] Suspect DKIM failure to Microsoft destination >> Message-ID: <[email protected]> >> Content-Type: text/plain; charset="utf-8"; Format="flowed" >> >> 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 >> >> [email protected] >> >> badsender.com >> >> lepatron.email >> >> Facebook Twitter >> Linkedin >> >> >> Book a meeting with me >> >> >> >> >> >> 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 >> > >> > _______________________________________________ >> > mailop mailing list >> > [email protected] >> > https://list.mailop.org/listinfo/mailop >> -------------- next part -------------- >> An HTML attachment was scrubbed... >> URL: >> >> ------------------------------ >> >> Message: 3 >> Date: Wed, 6 May 2026 14:40:12 +0100 >> From: Paulo Azevedo >> To: [email protected] >> Subject: Re: [mailop] Suspect DKIM failure to Microsoft destination >> Message-ID: >> >> Content-Type: text/plain; charset="utf-8" >> >> 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 >> > >> > lepatron.email >> > >> > Facebook Twitter >> > Linkedin >> > >> > >> > Book a meeting with me >> > >> > >> > >> > >> > 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 >> > >> > _______________________________________________ >> > mailop mailing >> > [email protected]https://list.mailop.org/listinfo/mailop >> > >> > _______________________________________________ >> > mailop mailing list >> > [email protected] >> > https://list.mailop.org/listinfo/mailop >> > >> >> >> -- >> -- >> Paulo Azevedo >> -------------- next part -------------- >> An HTML attachment was scrubbed... >> URL: >> >> ------------------------------ >> >> Subject: Digest Footer >> >> _______________________________________________ >> mailop mailing list >> [email protected] >> https://list.mailop.org/listinfo/mailop >> >> >> ------------------------------ >> >> End of mailop Digest, Vol 70, Issue 10 >> ************************************** > _______________________________________________ > mailop mailing list > [email protected] > https://list.mailop.org/listinfo/mailop
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