If you haven't done this yet - start with the outlook postmaster troubleshooting documentation and open a support ticket with them.

https://sendersupport.olc.protection.outlook.com/pm/troubleshooting.aspx

Matt

On 2021-03-09 7:07 a.m., s...@circlenet.us wrote:
You are not alone sir, for reasons as yet unknown outlook.com has recently started blocking my range as well. If I make progress in contacting someone with clue I will pass that information along privately.

Sam Moats

On 2021-03-08 16:18, Dan Walters via NANOG wrote:
Good afternoon,

So I'm looking for a contact at Microsoft in particular someone on the
outlook spam protection/prevention team to assist us with a IP block.
I have allready signed up for SNDS and there is no data given .
Please feel free to contact me off the list.

Best Regards,

Daniel Walters

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