https://gitlab.synchro.net/main/sbbs/-/issues/925#note_7196
I'm using these as my blocklist and it seems to work pretty well. It'll occasionally block stuff from hotmail and live.com etc users but Micro$oft does the same to me, so their fair game.
```
zen.spamhaus.org
dnsbl-1.uceprotect.net
dnsbl.dronebl.org
bl.octopusdns.com
```
--- SBBSecho 3.25-Linux
* Origin: Vertrauen - [vert/cvs/bbs].synchro.net (1:103/705)