Email can derail even those with the best of intentions, because every time a new one pings in, our instinct is to want to open and respond.
However, not all emails are made equal, and many do not require an immediate response. Try making a folder for emails and assign those emails a day by which you will reply to them.
That way, you free yourself of the burden of feeling like you need to reply straight away, but you’ve also set yourself a deadline to respond.