This was Microsoft's response to our inquiry.
Quote
Hi ,

Thanks for your patience while we investigated your request.

Below your IP address(es) and their status(es) are listed.

Not qualified for mitigation

108.174.193.28;

The IP(s) above do not qualify for mitigation.

So, if you use a Microsoft email account (hotmail, outlook.com, live.com, or microsoft.com address. you cannot receive email from us. Consider changing providers. If not possible, try opening a support ticket and asking them to fix the problem. In your support ticket, be sure to point out that we use DMARC, DKIM, and SPF and have never had a single spam incident in the 28 years we've been in existence. We are also not listed on ANY spam blocking lists. This is clearly an overreaction to something by Microsoft.

Paul Schmehl CI 6
geek@stovebolt.com
Stovebolt Staff: Geek