How Many Spam Can a Spam Bot Spam?

Mega-D is one of the most prolific spam botnets accounting for around 7 percent of the spam traffic worldwide. It once accounted for as much as 50 percent of the world’s spam volume but has quieted down since the high-profile takedown of the McColo hosting service, and the 2009 takedown of its command-and-control (C&C) servers. [...]