This week, an ISP in northern California named McColo was shutdown after an investigation on its services rendered the company as a prime host for most of the world’s spam. The shutdown occurred on Tuesday the 11th, and security firms everywhere saw an immediate drop of 75-percent on active email spam—globally.

At this time, it is unclear whether or not legal authorities are going after McColo. The Washington post reported that both the FBI and the Secret Service was contacted, but neither gave any comments. It is well known that major spam operations are part of internet stings performed by law enforcement State side.

According to reports from many ISPs and security firms around the globe, the huge drop off in spam levels was a result of other major backbones taking their links to McColo offline. According to the charts however, spam levels are already on the incline.

Source : Tom's Hardware