How do I remove my emails all at once

Dr6155 Said:

"How do I remove all my email at one time?"

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You have an iPhone 7, but try the following:

Go Here: How to delete all your mail at once on your iPhone 4 (updated for iOS 6, including iPhone 4S and iPhone 5). It is an older post (2011), but maybe it would work, all having to do with selecting it all.***

***Source: How to delete ALL 5000 + inbox with ONE step on iphone 6 ? - Apple Support

Open the folder, select edit at the top right, tap select all, then tap delete or trash at the bottom.