Tips for a Healthy Inbox
Organise
Use folders or labels to organise and manage your email. If you have a good reference system set up, you won’t ever have troubles looking for mail. Paper documents are filed for ease of use, and email should be treated the same way.
Archive
Keep your correspondence; you never know when you will need it. Most modern email systems provide plenty of space, so it’s good to get into the practice of saving any mail that isn’t junk. That way you can’t be accused of not sending somebody something when you have actually sent it and vice versa. During my career I have referred back to old emails on many occasions and have resolved a few disputes by looking in my archived mail.
Create filters/rules