Microsoft Defender: Re-attest your network access?

Just received the following email that passes SPF and DKIM from outlooksupport at [outlook.mail.microsoft](http://outlook.mail.microsoft)

The link in the Email goes to [https://aka.ms/snds/reattest](https://aka.ms/snds/reattest)

It does show our actual mail server IP address. Is this something real? When exactly is the year 0001?

Screenshot in comments