How to Delete All Emails on Your iPhone or iPad on IOS 12
A lot has changed from 2013, but not so much in the way of ease of deleting emails on your iPhone or iPad. Back then, I managed to find some undocumented information that helped me in deleting all my emails which I outlined here. However with multiple version updates and several years, the “Mail” application still has features that require you to do a little digging.