Specific Entries
- Open Outlook.
- Click New Email.
- In the new email window, start typing the address you want to remove in the To field. When the unwanted address shows click the X button next to the address.
All Entries
- Open Outlook.
- Click the File button at the top left of the screen.
- Click Options.
- Click the Mail tab on the left hand pane.
- Scroll down to the Send Messages section and click the Empty Auto-Complete List button.