A colleague here at LISA told me yesterday that he had observed approximately a 50% drop in traffic on his E-mail servers. Naturally, this was first a cause for concern, but then he learned about the disconnection of McColo - a major botnet command and control hosting site in Northern California, USA. Their two up-stream ISPs pulled their plugs on Tuesday afternoon. See the story in the Washington Post.

Naturally, I experienced an immediate urge to check $employer's anti-spam system for its observation on the situation.