AMERICA relays more spam to the world's inbox than any other country. Despite the CAN-SPAM Act, nearly 30% of all unsolicited e-mails between July and September were sent via computers in America, says Sophos, an internet-security firm. The nature of spam is also changing. Although penis enlargers and African fraudsters still abound, popular recent additions include fake e-cards and virus-riddled PDF attachments. The boom in digital music also provides a new avenue. As many as one in ten spam e-mails attach dodgy MP3 files or ringtones to lure the unwitting user, according to MXSweep, an anti-spam company.

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