Reply All

It's one of those functions that you need to use sparingly. Just because the email was originally sent to a whole bunch of people, doesn't mean you need to reply all...use that function only when necessary, otherwise - just reply to those that need to know. And for F@#ks sake if you do reply all, make sure you read the email that you're replying to so you don't look or feel like an idiot by replying with a "You're Welcome" to a Thank You that wasn't meant for you...I'm just saying.