On 21.10.2024 at 11:32 Gellner, Oliver via mailop wrote > On 17.10.2024 at 19:43 L. Mark Stone via mailop <mailop@mailop.org> wrote:
>> Back in May at the InboxExpo conference in Atlanta, I was told by a >> consultant to very large senders that they advise customers to set their >> DMARC to "p=quarantine" because they had been observing that Microsoft's >> processing of some emails was causing DKIM failures - in as much as 30% of >> their customers' email campaigns traffic. >> We didn't discuss the technical details (other than Microsoft's processing >> altered the emails in such a way as to cause the DKIM fails), but thought >> that might be helpful to share (possibly related?) as regards the OP's issue >> with Mimecast, with whom we had numerous difficulties, and whose Partnership >> we elected not to renew a while back. > I cannot confirm 30%, but when I grep Microsoft DMARC reports for temperror, > there are hundreds of hits. Nevertheless I don't see why you should change > your policy because one recipients is unable to reliably operate a DNS client. To update my own post, in the meantime Uriports published a blog post about the reoccurring problem of temperrors in DMARC reports sent by Microsoft: https://www.uriports.com/blog/outlook-com-dkim-temperror-in-dmarc-reports/ According to their statistics 0,6% of all the DMARC reports which they receive from Hotmail / Outlook contain a DKIM result of "temperror". That's 600 times (or 60000%) more than the average of other providers. Uriports runs a DMARC monitoring service and receives reports from many different companies, so the issue does not seem to be restricted to our DNS servers. They claim: "The primary cause is Microsoft’s ongoing DNS resolution issues, which the company is actively working to resolve." I'm unsure if that's true and and when Microsoft started working on those DNS resolution issues, as I mentioned this problem on this list already in the beginning of 2023 and it is still ongoing. -- BR Oliver ________________________________ dmTECH GmbH Am dm-Platz 1, 76227 Karlsruhe * Postfach 10 02 34, 76232 Karlsruhe Telefon 0721 5592-2500 Telefax 0721 5592-2777 dmt...@dm.de<mailto:dmt...@dm.de> * www.dmTECH.de<http://www.dmtech.de> GmbH: Sitz Karlsruhe, Registergericht Mannheim, HRB 104927 Geschäftsführer: Christoph Werner, Martin Dallmeier, Roman Melcher ________________________________ Datenschutzrechtliche Informationen Wenn Sie mit uns in Kontakt treten, beispielsweise wenn Sie an unser ServiceCenter Fragen haben, bei uns einkaufen oder unser dialogicum in Karlsruhe besuchen, mit uns in einer geschäftlichen Verbindung stehen oder sich bei uns bewerben, verarbeiten wir personenbezogene Daten. Informationen unter anderem zu den konkreten Datenverarbeitungen, Löschfristen, Ihren Rechten sowie die Kontaktdaten unserer Datenschutzbeauftragten finden Sie hier<https://www.dm.de/datenschutzerklaerung-kommunikation-mit-externen-493832>. _______________________________________________ mailop mailing list mailop@mailop.org https://list.mailop.org/listinfo/mailop
