Permanently Delete an Email in Outlook Beyond Recovery
To permanently delete a message (without having the message go to the Deleted Items folder) in Outlook:
Turn off the Confirmation Dialog for Deleting Permanently in Outlook
To prevent Outlook from asking for a confirmation every time you delete a message:
Empty the Deleted Items Folder in Outlook
When you want to permanently delete all the emails that have been sent to the Deleted Items folder in Outlook, either use your mouse or the Outlook menu.
Empty the Deleted Items Folder With the Mouse
Empty the Deleted Items Folder From the Outlook Menu
Empty the Deleted Items Folder When Outlook Closes
You don’t have to empty the Deleted Items folder. Instead, set up Outlook to automatically and permanently delete emails in the Deleted Items folder when you close Outlook. To delete all items from the Deleted Items folder when Outlook closes:
Why Does Outlook Maintain a Deleted Items Folder?
The Deleted Items folder in Outlook is a convenient way to manage messages that you no longer want. The Deleted Items folder is a temporary location for the messages you delete and makes it easy to recover accidentally deleted items. If you want to make sure a message cannot be recovered, delete it and then empty the Deleted Items folder. When you empty this folder, any messages, contacts, and other items in the folder are also permanently deleted. When you want to avoid sending a message to the Deleted Items folder and want the message permanently deleted, there is an option.