A simple way to increase your productivity is to turn off auto notifiers. It’s simply not necessary to check email constantly throughout the day, and doing so will regularly interrupt more important tasks. After receiving thousands of emails I can safely say that I’ve never received one that couldn’t wait 12 hours or so.
Process your inbox in batches. Make it once or twice a day, and try to get your inbox down to zero. This will allow you to plow through the rest of your productive tasks without constant interruption.
I'm sad to say I use outlook at work. Turning off auto notification is called: "Turn Desktop Alerts on or off" in the outlook help page:
On the Tools menu, click Options.
On the Preferences tab, click E-mail Options, and then click Advanced E-mail Options.
Under When new items arrive in my Inbox, clear the Display a New Mail Desktop Alert (default Inbox only) check box.