Without a simple strategy to deal with it, you can get caught up wasting time checking through your email at every opportunity. Dealing with multiple emails in the same block of time is much more efficient
Try giving yourself less time to complete tasks e.g. give yourself an hour to write that report instead of 2 hours, or give yourself 15 minutes to check your mail instead of 30 minutes.
WHY? If you give yourself too much time to complete a given task, there is a good chance you’ll find a way to use up all that time, even if you didn’t really need it.