Outlook will show the nicknames and automatic completion cache as a pull down list which are the recent addresses resolved and sent. You may enter the wrong address for a recipient or the recipient changes their address. You can refer to the following steps to remove an address from this list or clear the entire list to disable Outlook and Yahoo Auto-Complete.
Here are the steps to remove entries from the Auto Complete cache
- Open a new email message.
- Type the first few characters of the AutoComplete entry that you want to remove.
- When the entry appears in the list of suggested names, move your mouse pointer over the name until it becomes highlighted. Make sure you do not click the name.
- When the “X” icon appears next to the highlighted name. Click X to remove the name from the list, or press the Delete key on the keyboard.
To disable AutoComplete or clear your AutoComplete completely in Outlook.
In Outlook 2010 - 2016, follow the steps below to have this completely disabled. This is a sort of required in order not to send an email to a wrong recipient. - click the File menu and - select Options. - In the Outlook Options window click the Mail tab. - Scroll down to Send messages. - Uncheck the Use Auto-Complete List to suggest names when typing in the To, Cc, and Bcc lines box.
Note: To clear the AutoComplete list, simply click the Empty AutoComplete List button. You’ll see a confirmation window about clearing the AutoComplete list, click Yes.
Outlook AutoComplete should be completely disabled and any history that was in the auto-complete list should be completely erased (if you clicked the clear autocomplete button).
I hope you found this blog post on How to disable Outlook and Yahoo Auto-Complete helpful. If you have any questions, please let me know in the comment session.