That works great if the spammer hasn't forged the return address. Many spam emails contain forged headers and a working link to the scam website in the body.

That works great if the spammer hasn't forged the return address. Many spam emails contain forged headers and a working link to the scam website in the body. A few years ago some #$^%er sent a few bazillion porn dvd spam emails with one of my domains in the header. An amazing number of admins/folks like yourself actually reply to a forged address.