How many times do you check your email? Focus is very important for accomplishments, and constant interruptions kill productivity.
Some of the biggest disruptions to productivity are emails, phone calls, and text messages. Somehow we think that people need instant access to us. When that phone rings or email pings, we think it's our responsibility to stop everything and focus our attention on the perpetrator of that message. We are scared we're going to miss something important, and we love to feel busy without tackling the huge projects, so we email and email and email more.
Communication is vastly important, but a good practice is to be proactive and not reactionary. This applies in all of life, as well as email. Take control of your life and your communication devices. Don't let them control you. You decide what is urgent, and what should have your instant attention.