Just had 50+ new users (spammers or troll accts?) sign up from Mailserver @ koiot.de

Anyone know anything about this Email Server?

So the .de of course means Germany.
It looks like the domain belongs to a German IT and Web Developer.
This has the marks of an old school DOS attack (probably wouldn’t do any good these days) or more likely the prep for a raid. Do those still happen?

Apparently koiot.de is a play on the German word for Coyote.