I've already talked about how to have an empty inbox all. the. time.
I want to help you be an email rock star, i.e., be less stressed about your email, all while handling it in a way that makes you look like a super star.
#1 Respond in a timely fashion.
I hate having email in my inbox. I loosely use strategies from GTD to stay on top of tasks, and for email I have a folder I've simply named @Action. The @ sign puts it at the top of my Inbox, and I can "file" emails in there I want to get to, emails that will take more than 2 minutes to deal with, at the time I've scheduled to work on emails (i.e., schedule time daily to respond to and deal with emails).