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I just went to my cloud provider of my choosing and started to add floating IPs. After a few tries I got a good one. I went through the unblocking process once, and I decided not to do it again. Especially Microsoft gave me a hard time, they started to request documents and then let me wait a few weeks until they replied: we don’t unblock, and we don’t tell you why.

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consider yourself lucky you even got a response.

My IP is sparkling clean for many years now, dkim/spf etc, but gets blocked on any MS mail server. Tried appealing and heard nothing whatsoever.

Is it possible that Microsoft distrusts your IP range? Some providers are known not to be very responsive to abuse reports. And then whole IP ranges get (soft) blacklisted, and individual IPs can’t be unblocked, without having a very strong case.

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