changes to the CBL that occured in January 2021. In short, the CBL infrastructure was replaced by the Spamhaus XBL structure
http://dnsbl.burnt-tech.com/
domain is for sale
+ http://rbl.dns-servicios.com/rbl.php
+ website can not be found
00_NEEDS_RECHECK
https://antispam.imp.ch/
no usage policy
not explicitly mentioned but it’s 127.0.0.X where X is the class from https://dronebl.org/classes
http://psbl.org/
query zone: psbl.surriel.com
- http://rbl.dns-servicios.com/rbl.php
+ no usage policy, but seems implied that usage is free
+ listing policy
+ no explicit, complete policy given but sending to spamtraps is mentioned to get you listed and seems the exclusive mechanism
+ return codes
+ not documented, probably only boolean
http://rbl.schulte.org/
http://rbldata.interserver.net/
may be dead: http://www.blalert.com/dnsbl/rbl.interserver.net