SpamCop’s domain name expired and all IP addresses that are checked against bl.spamcop.net now return ‘listed’.
Was the project just abandoned?
Or are they deliberately returning “listed” for every request to force people to not use their service anymore?
Major tech companies such as Microsoft, Google, and Cisco rely heavily on this blacklist as well, meaning that at the moment you can’t send emails from hotmail.com gmail.com mail.yahoo.com and many more email services.
If you are still using this service, just stop!
If you use cpanel, go to WHM > Exim Configuration Manager > RBL and uncheck it.