how to flag email in outlook
To set a flag on an email you have received, simply choose from one of the following options: 1  Option 1 â Click on the Contact you wish to flag and left-click on the Flag icon in the toolbar. 2  From the menu that appears, set the flag by date or set up a custom flag. 3  Option 2 â Open the contact you wish to flag.ow to set a Follow-Up Flag on a New Email. How to set a Follow-Up Flag in Your Inbox. How to set a Follow-Up Flag on a Contact Card. How to set a Follow-Up Flag for a Recipient. 1  Open a new email. 2  Type up your email as you normally would.