Spammers adopt slippery tactics to bypass ISP defences
Spam levels are rising even though the percentage of junk mail spewed out from compromised PCs directly is on the slide. Tests by email security firm MessageLabs on 90,000 inbound connections to its honeypot servers on 1 October 2004 revealed that 79 per cent of the connections came from "open proxy" computers or zombies (computers typically compromised by a virus or Trojan infection). The same tests on 1 February 2005 showed this number had dropped to 59 per cent.
By John Leyden at The Register.
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