Snoper
Someone who incessantly checks snopes.com every time they receive a forwarded e-mail, and makes sure to let the sender know they snoped it, and the e-mail is false.
E-mail from T-Bone to Lorenzo: "Drinking bleach will help you pass a drug test."
E-mail from Lorenzo to T-Bone: "Sorry, I snoped it, and you are wrong. Drinking bleach won't help you pass a drug test. Drinking bleach will KILL YOU, CLOWN!"
E-mail from T-Bone to Lorenzo: "Whatever. Quit being such a snoper."