I usually just scan the UL/hoax/scam emails and respond accordingly. If it's yet another ho-hum, run of the mill type UL, I'll delete it happily. If it's something that *sounds* like it's true - like oh, lead in lipstick causing cancer, I'll respond and say "Y'know... This is bull. Chill!" I actually got one one time, I don't remember what, but it was targeted at women in general and basically wanted to scare women. I emailed the woman who sent me that email, and I told her it was just a hoax. She emailed me back saying, "Yeah I know I just got another email that says it's a hoax..."
If I get a scam email - you know those Nigerian rich stiffs, they want you to help secure the account of ohh, a bazillion dollars type emails? I'm probably very rude but I usually respond with, "Thank you for sending me yet another classic scam email. Not *all* Americans are as stupid as you think we are. Have a good day!" ...I haven't gotten ANY emails of this type in a long time for some reason.
I actually got one where they were very, very specific: They were targeting Deaf Americans. Some rich deaf kid in the UK's parents had just died, and they wanted someone to go up there and take care of this kid, and the carer would get paid a very hefty fee for doing this. I emailed back with my sincerest apologies, but made it clear I knew it was a scam. Never got anything else like it either.