"Although there's no denying that some countries have significantly reduced their contribution to the spam epidemic over the past five years, the US still holds the crown," said Cluley. "Though its spam contribution has significantly decreased since Bill Gates's proclamation - falling from almost half of all spam relayed at the end of 2004, to 21.3 percent by the end of 2007, and now resting at 19.8 percent -- this shows there's certainly no quick fix."