Is there some sort of law that makes computer viruses illegal? Is there any way for someone to craft a virus so that if someone sends spam your way, your computer can automatically send a a horribly destructive virus back to the Spammer? Would that be illegal?
How would you know who sent you the spam? The return address on email is easier to forge than the return address on a paper envelope, and back-tracking the ip’s in the header can be difficult even for experts.
Having said that, it would be illegal