matt haughey provides an apt analogy for what the klez virus is like:
” For someone that has never fell for a virus message or been infected, this is the equivalent of trying to buy a car and hearing that the credit check showed you were attempting to pass bad checks in Long Beach under your name, or that your name was on a credit card used to buy jewels in Kuala Lumpur (both things have actually happened to my wife and I). The only problem with this virus is there is no way to verify that someone sent a message, or for someone to look up my track record of being virus free and knowing this message was a fake.”