Generally speaking receiving mail messages means receiving work to be done. A simple rule to follow is that if that work will take more than two minutes, plan to do it later, make a note of that somewhere in your agenda (or Google Calendar of course) and move on to empty your inbox.
A suggestion: make a label for every working day. If you receive a message that contains something you can do best on tuesday, label it 'Tuesday'. Then archive it. Now when you arrive on Tuesday, spend an hour or so doing all jobs that are labelled 'Tuesday'. How does that work for you?