Microsoft 365 is blocking my e-mails,for no evident reason

Dles 10 Reputation points
2023-03-16T16:02:00.3166667+00:00

I am using Sender as a listserve e-mail provider. They have given me an IP that is squeaky clean. No spam blacklistings for it. My SPF and MKID are correct and solid. I get 10/10 on mail-tester.com. My mail isn't spammy, and it is up-to-snuff in every respect. But Miccrosoft 365 is throwing it in my recipients Junk folders!

I have requested delisting in the Office 365 Anti-Spam IP Delist Portal - https://sender.office.com/, but what I get back from them is "The request to delist IP address 185.3.229.12 has been denied." No reason given. I ask to escalate, and they say pretty much the same.

This is pretty asinine. Least they could do is tell me WHY they don't like my e-mails. What are my options?

Office
Office
A suite of Microsoft productivity software that supports common business tasks, including word processing, email, presentations, and data management and analysis.
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