It seems as though my website over at DNSBL.com has turned into a graveyard for dead DNSBLs. Over the past few years, I've observed more than a dozen blacklists go missing, and I've written about more than a dozen others who were shut down prior to that or weren't valid to begin with.
Here's a new tombstone for you to review: DNSBL bl.csma.biz no longer exists.
Remember when there used to be hundreds of live and useful DNSBLs out there? Well, maybe not hundreds. There did, however, used to be more than three, once upon a time.