Some providers have quit

[superstes]

I've looked through the existing providers and found that some have quit:

• db.wpbl.info => see: http://www.wpbl.info/
• *.sorbs.net => see: https://www.dnsbl.com/2024/06/status-of-dnsblsorbsnet-dead.html and https://verifalia.com/blog/farewell-to-sorbs-a-pioneering-dnsbl-shuts-down-after-two-decades
• ix.dnsbl.manitu.net => see: https://nixspam.net/ and https://www.dnsbl.info/dnsbl-manitu-net.php
• dnsbl.cyberlogic.net => see: https://www.dnsbl.info/dnsbl-details.php?dnsbl=dnsbl.cyberlogic.net
• virbl.bit.nl => see: https://www.rollernet.us/2017/01/shutdown-of-virbl-dnsbl-bit-nl/
• Possibly: *.msrbl.net
  I found some provider mentioning that they have quit: https://www.dnsbl.info/dnsbl-details.php?dnsbl=phishing.rbl.msrbl.net
  The organization's website looks not really trustworthy: https://www.msrbl.com/
• wormrbl.imp.ch => is not listed on their website https://antispam.imp.ch/
• Rename: spamrbl.imp.ch => spamrbl.swinog.ch as seen on their website https://antispam.imp.ch/

I have gathered some info about the remaining providers (and added some more): https://github.com/O-X-L/dnsbl-checker/blob/latest/Providers.md