If you want to delete a mailbox on your iPhone 11, you can do so by following these steps:

  1. Open the Mail app on your iPhone 11.
  2. Tap on the mailbox that you want to delete.
  3. On the top right corner of the screen, tap on the three lines in a triangle icon. This will open up the Delete Mailbox menu.
  4. Tap on Delete Mailbox to confirm your decision and then tap on OK to finish deleting the mailbox. ..