If you're like us, you use the read and unread status of an email to determine if you still need to read it or do something about it. This means that after you've read an email, you need to be able to mark it as read if it requires action later on. In this tutorial, we'll show you how to mark emails as read the war on land from your Yahoo Mail email account.
Follow these steps to mark an email as unread:

Now that you know how to mark an email as unread in Yahoo Mail, let's talk about how emails are automatically marked as read. As soon as you select an email to read it, Yahoo will mark it as read. A later tutorial will explain how to change the number of seconds Yahoo Mail will wait before marking an email message as read, but for now, just remember that simply selecting it will change its status from Unread to Read.
To manually mark an email as Read without opening it, just right-click on it, and choose "Mark as Read" from the context menu. Another way is to use one of Yahoo Mail's keyboard shortcut, and use "k" as keystroke:
Tip: notice that each menu item displays letters and combinations of keys on the right side - this just indicates the keyboard shortcut corresponding to the particular command!