Open your email and go to the Inbox. Tap the Edit icon. Tap Select All. Tap trash or archive. If you only see Archive, tap and hold Archive then you’ll see other options to also select the messages to trash.
How do I delete all emails in Apple Mail?
1. Open your email.2. Open the envelope icon.3. Tap Edit.4. Tap Select All. Or if you want, select the emails that you want to delete.5. Tap Trash or Archive.6. If you only have Trash, touch and hold Archive to see other options like Trash Selected Messages.