For reasons unknown, I recently started receiving rejections sent to outlook.com or Hotmail addresses from my MIAB. Hadn’t had any issues in a while. I am using a Linode virtual server and have been for several years. Early on I had problems and was also able to contact Microsoft to “mitigate the problem”. Of course, it wasn’t MIAB and it had become my problem when MS had problems with a range of IP addresses (IPV4) from Linode.
Well, after 3-4 days and at least 3 email exchanges, along with reports from mxtoolbox and one from a UK government server test, I received the email message below.
So those of you with the problem, be persistent. My takeaway is when they come to find out you are a real person, running a real email server according to all the standard conventions and protocols (DKIM, SPF, etc.) they will correct the problem.
My name is ___________, and I work with the Outlook.com Deliverability Support Team.
We have implemented mitigation for your IP (****) and this process may take 24 - 48 hours to replicate completely throughout our system.
Outlook.com Deliverability Support.