So, anyway, SPEWS/Osirusoft is shutting down - apparently due to lawsuits, DDoS attacks on their servers, etc. OK, fine, so Joe Jared is taking his ball and going home. That's his right.
But as one last act of pissing in the pool, he didn't just turn off the blacklist - he blacklisted THE WORLD! No, not the ISP, the entire net! 0.0.0.0/0! EVERY MAIL SERVER ON THE NET! One big "FUCK YOU ALL!" on the way out the door. Why is this is problem? Because a lot of admins had, stupidly IMHO, configured their servers to automatically obey the SPEWS list and black hole all email from the listed servers. So any server using the list thusly started refusing ALL email. Additionally, SpamAssassin, an application used by many, can be configured to blindly use the SPEWS list. Or it can be used to score email. Well, everyone using SpamAssassin with SPEWS was hit by this as well.
This should be a wake up call for mail admins, and users of filter software, don't blindly obey blacklists. You're handing over control of your server to someone who may have the ethics of, I don't know... someone who is willing to trash email net wide. I can't really think of a good comparison. As far as I'm concerned, this is *worse* than what the average spammer does.