How Do I Resend An Unsent Email In iOS Mail?

Launch the Mail app on your iPhone and iPad and navigate to the screen that shows a list of all your mailboxes (you may need to tap the button at the top left of the screen to get here). From the listing of mailboxes, tap on Outbox and then pull down on the screen to attempt the sending process again. If you would rather delete the message from your Outbox, you can do that by tapping on "Edit", selecting the message, and then hitting the Trash icon.