Security company Sophos has found that 42 percent of all spam sent this year came from the United States. The research was conducted using its global network of honeypots, which are computers designed to attract spam emails and viruses. This new data indicates that United States anti-spam legislation has made little impact in the battle against spam. "When we released the first report back in February, the US had the excuse that the Can-Spam Act had been in existence for only three months," said Graham Cluley, a senior technology consultant for Sophos.