How to delete all emails
How do I delete all 3000+ emails in my in mailbox at one time?
MacBook Pro 15″, macOS 10.12
In Apple Mail and Choose Inbox and upper most e-mail. In the Edit Menu of Apple Mail choose Choose ALL and Delete on Keyboard.
Under normal setup - this will move all the 3000 + e-mail to e-mail Trash.
Under Mailbox in Menu Bar pop down and choose Erase Deleted Items.