U.S. junk e-mailers sent more spam than those in any other country during the first quarter, a security company recently reported, although China is hot on America’s heels.According to U.K.-based Sophos, U.S. senders accounted for 23.1 percent of the world’s spam in 2006′s first three months. Chinese spammers sent 21.9 percent of global junk mail during the same period.

