It would be great, if this topic can get priority soon. We just encountered issues with mail delivery to Microsoft 365 Exchange servers. All emails sent via Mailjet have been marked as spam. We assume this may be the issue. Once a mail is moved from Spam to the inbox, the sender gets a better rating at MS, so that further emails are not listed as spam. But this is not a solution for our customers.
Also this issue downrates our rating on mail-tester.com significantly. See also this serverfault post, which has the same issue:
It would be great, if this topic can get priority soon. We just encountered issues with mail delivery to Microsoft 365 Exchange servers. All emails sent via Mailjet have been marked as spam. We assume this may be the issue. Once a mail is moved from Spam to the inbox, the sender gets a better rating at MS, so that further emails are not listed as spam. But this is not a solution for our customers.
Also this issue downrates our rating on mail-tester.com significantly. See also this serverfault post, which has the same issue:
https://serverfault.com/questions/1074935/why-is-this-dmarc-failing-verification