Inbox Pause does exactly what you think it does. It pauses your incoming email while you get your head down on an important piece of work (all of your work, right?).
It can also deliver your emails on a schedule. So rather than having to discipline yourself to checking your email only three times a day, it will ensure you can only see them that often.
What’s more, it can send an out of office reply saying how people can contact you with urgent questions (although you might want to make sure your definition of urgent is the same as theirs.
I’ve been using it for a few weeks now, and it is great. Give it a go.