One of the most effective ways I have found for managing email is to apply the 4 Ds for Decision-Making Model. By applying the model, you can quickly decide what action to take with an email and more importantly, which ones you can delete right away.
If you’re struggling with managing your email, I highly encourage you to read 4 Ways to Take Control of Your Inbox. In particular, step 4 outlines how you can apply the 4 Ds Decision-Making Model when processing email.
If you start applying the model, you’ll quickly find that your email is much more manageable.