The other day, someone forged my e-mail address and sent mail to a bunch of other people. (It happens every day.) This time, it hit a network that checked my domain’s SPF records and realized that the message came from an unauthorized server. Then it “helpfully” sent me a message delivery failure notice. I’m sorry someone sent unwanted mail, but we both know that it wasn’t me. What possible use is there in sending me the bounce message? (If you absolutely must send the bounce message, why not take a trick from the spammer, virus, and worm playbook and choose someone else on the Internet randomly? You have a non-zero chance of finding someone who cares about that message — but I don’t.)
Why haven’t all mail server administrators passed the One Question Certifcation Test for E-mail Filter Authors yet?