If you receive a significant amount of email, then it’s not always easy to keep up with which mails you have and haven’t read. You may indeed mark emails as ‘unread’ to remind you to action them later and if you do it’s easy to lose them among pages and pages of old emails.
Help is at hand though through a simple Gmail command. Just enter the following the search box and start adding to your to-do list as you discover all those emails you meant to respond to!
Enter ‘label:unread’. Job done.