Microsoft contact - emails being blocked from our app to our users

[Erik Levinson via NANOG <nanog () lists nanog org>]

Hello, does anyone have a Microsoft contact that could help with an email
deliverability issue that started approximately two days ago?

We (LeapAP) are seeing a large and increasing volume of mail errors from
Microsoft, such as the below (XXXX is our dedicated IP at our ESP) and are
unable to deliver mail to our users with the following destination domains
(so it seems like the hosted Office 365 domains aren't impacted, but only
the free/Outlook.com ones):
hotmail.com
hotmail.ca
live.ca
msn.com
outlook.com
live.com

4.7.650 The mail server [XXXX] has been temporarily rate limited due to IP
reputation. For e-mail delivery information, see https://aka.ms/postmaster
(S775)

SNDS shows nothing abnormal for the IP address during the involved time
period or earlier, but I can only see up to yesterday @ 18:00 PT there.

We submitted the Microsoft form at https://olcsupport.office.com/ and have
a ticket number as a result, which I can share as well.

Appreciate the help as we're quite impacted and getting a lot of support
tickets.

Thanks

Erik Levinson
LeapAP
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