The Rustock botnet, which was taken down in March, had been sending as many as 13.82 billion spam emails daily, accounting for an average of 28.5 percent of global spam sent from all botnets during the month, according to a new report from Symantec.

During the first half of 2010 Europe saw the most spam growth, bypassing North America, South America, and Asia-Pacific to earn the “Top Producer of Spam” title, according to a new report from Trend Micro.

Spam sent from service providers’ own networks is a serious issue, according to a new report by Osterman Research and Commtouch.

Symantec has released its April 2010 MessageLabs Intelligence report, which found that Rustock has surpassed Cutwail as the biggest botnet both in terms of the amount of spam it sends and the amount of active bots under it control. While Rustock has reduced the output of individual bots by 65 percent, it has increased the [...]