Report: U.S. Sends Most Spam Mail

The U.S. remains the world's biggest spammer, according to security firm Sophos, which on Friday released its quarterly report on the world's top spam-offending countries--dubbed the "Dirty Dozen."

The U.S. came in well ahead of its rivals, according to the report, being responsible for 28.4 percent of all spam. South Korea was second (5.2 percent), followed by China (4.9 percent), Russia (4.4 percent) and Brazil (3.7 percent).

"It seems as though a major American spammer is arrested every other week at the moment but, despite these high-profile law-breakers being put away, the U.S. continues to relay far more spam than any other nation on the planet," said Carole Theriault, senior security consultant at Sophos, in a statement.

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