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Undelivered email to wrong address

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Had an office computer get infected with Rustok-B and had similar symptoms. McAfee virus was completely clueless about the infection. The only way to clean the mess was to do a virus scan with a boot CD. Try the AVG rescue CD. Also, check the packet traffic with WireShark or Nirsoft SmartSniff and see if you can see any outgoing traffic on tcp port 25.