Comcast, the US cable giant, is threatening to disconnect customers whose infected PC are being used to relay spam messages.

Up to 30 per cent of spam is now spewing from hijacked "zombie" PCs. Spammers use Trojan horses and worms to take over PCs and use them as spam engines, a practice that can severely disrupt the operation of ISPs.

Recently, many Comcast customer IP addresses were recently blacklisted because of this spam-spewing zombies. The cableco has sent letters, warning customers who have been found with spam -sending PCs that they risk disconnection unless they clean up their act.

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