Most of the world's spam comes the U.S., ZDNet UK reports. The U.S. is number one with nearly 57 per cent of all spam originating there, says Sophos, a U.K. anti-virus company. Canada is number two, though, when it comes to spam country of origin. Mind you, Canada has long way to go before it is as notorious as the U.S. for spam. The report says Canadian spammers account for less than 7 per cent of the world's unwanted unsolicited mail.