There is a reason that every single email program includes both "Reply" and "Reply to All" functionality. There is a difference. If there wasn't, there would only be one button. "Reply" means that you will simply reply to the person who sent you the email, no one else. "Reply to All" means that you will reply to everyone included on the list of emails that the sender added to the To: or CC: fields. This is a very important distinction that very few people seem to grasp. It will save the rest of us lots of time deleting your email that we don't give two shits about.
If you have any questions, please contact me. I'm more than happy to help you stop being a douchebag.