After that time, it will be permanently deleted from your account and can't be recovered. Delete messages. When you delete a message, it stays in your trash for 30 days. After that time, it will be permanently deleted. If you want to remove a message from your inbox but don't want to delete it, you can archive the message. Delete a single message. Method 1: Manually add All Trash and All Junk to Mail Favorites. Find the plain text Favorites and hover your mouse over it. Click the Add (+) button when you see a circle icon with a plus sign. A pop-up will allows you to choose a mailbox to add.