I setup a new mail server with Stalwart and have been getting automated mails to my postmaster address (security treat results mostly).

Pretty neat.

I tried to contact Hetzner and others about customers scanning my ports. Nobody cares about that. I took issue when I kept getting firewall alerts for port scans on open Plex ports.

I went down a crazy rabbit hole and found a bunch of domains that were random parts of street addresses. Obviously created automatically and they were purposely trying to make it harder to find related domains.