Have you tried the options available via the Junk tab within Outlook where you can navigate through the options and to the Blocked Top-Level Domain list via the International tab?

Moonshine I have not...thanks I will give it a try.

This is what I have done:
On the int. tab. I selected some of the 2 letter domains. We shall see....


But I also have a @xxx.GDN, no option for that, so I blocked Grenada (GD) and Guinea (GN).


That leaves me with @yyyy.Live, @xxx.today, .club, .xyz