homepage contains non-informative end-of-life message
and one day the txt records announced end-of-service with 100% false
positive listings - however, this wasn't permanent either

Sources:

- https://www.theregister.com/2024/06/07/sorbs_closed/
- https://www.heise.de/news/Ausgeblockt-Antispam-Blockliste-SORBS-ist-abgeschaltet-9752366.html (2024-06-07)

NB: previous choice isn't available on (some?) Fedora 39 systems

to fix compile errors on Fedora 40

deprecated since at least python 3.12

and improve error checking when parsing positional arguments

and fix missing comma

and add/remove a few entries

Source: https://www.blacklistmaster.com/blacklists

i.e. just a few of the alive ones as that alive list currently also
contains many dead ones

Source:
https://multirbl.valli.org/list/

i.e. just what is still alive

Source:
https://github.com/matteocorti/check_rbl/blob/0262c7104267c8555e80dea8e2d1347df0c7a485/check_rbl.ini#L1-L161

i.e. the small subset that isn't dead for many years or obviously broken

Source:
https://github.com/kuyint/rbl-check/blob/8cd9e1301385dd31f82ce7fae6e5043e020541cc/rbl_check.sh#L17C10-L71C65

cf. https://en.wikipedia.org/wiki/Comparison_of_DNS_blacklists