DNSBL Resource Updates

Last week, at the MAAWG (Messaging Anti-Abuse Working Group) 11th General Meeting held in Arlington, VA, I presented my updated Blacklist Statistics Center. I also gave everyone within earshot a lot of data and a healthy dose of opinion regarding various blacklists, and shared my take on what senders and receivers should consider when measuring the value and reputation of a blacklist.

And, I'm finally fleshing out the blacklist review section of the site. To that end, I've just published reviews of PSBL, FIVETEN, and Spamhaus ZEN. This is to add to the list of ones I've already written (APEWS, SORBS, Spamcop, CBL, Korea and UBL).

I also invented a new blacklist. LUCKYSEVEN isn't suitable for spam filtering, but it helped to put a graphical face on arbitrary spam blocking methodology. Did you know that if you block mail from any IP address containing a 7, you'll block about 50% of spam? Of course, you'll block about 43% of non-spam at the same time, making it just about completely useless. But....still! 50%? Isn't there some value to that? No, not really, but it makes for a neat graph.