This article will explain how you can mark an email message as unread.
This functionality allows you to mark emails as read without you having to open each email individually; which is especially useful if you have a large number of emails you do not need to read.
Login to the 123-mail webmail.
Click on the Email icon in the main toolbar.
In the right pane, Click on the relevant email you would like to mark as unread. You can use you Control or Shift button to select multiple emails at once.
Click on the Edit tab and click on the Mark as drop down and select Unread.
Your email message will now be set to unread