Delete the folder by right-clicking it and selecting Delete Folder. Click Yes if you want to move the folder and its contents to the Deleted Items folder. Everything in the Deleted Items folder, including any folders you’ve deleted, is permanently erased when it’s emptied.

Locate and expand the Mailbox Store where the orphaned mailbox is located. … To permanently delete a mailbox, right-click it and choose “Purge.”

Choose Window > Previous Recipients in the Mail app on your Mac. Select the address you wish to remove. You may search for it or sort the list by clicking a column header. … Click Remove From List to delete it from the list.

Go to Settings and select Mail. Choose Inbox under Open Mail, then tap Edit in the upper-right corner. Select individual emails or choose All to delete them, then trash or archive them as needed. Tap Trash or Archive to dispose of them. If only Archive is visible, touch and hold it to see additional choices such as Trash Selected Messages

Go to Settings > General > Transfer or Reset Your iPad. If you’re erasing your iPad because you’re getting a new one and don’t want to lose all of your apps and data, you can use iCloud storage for this. … Select Erase All Content and Settings from the drop-down menu.