If you own a Sony Xperia device, there are a few ways to delete emails from the device. The first way is to use the “Delete Emails” option in the “Settings” menu. The second way is to use the “Delete Email and Data” option in the “Settings” menu. The third way is to use the “Clear Email and Data” option in the “Settings” menu.
Opening the email and pressing the 3 dots in the upper right corner. Selecting “Delete” from the drop-down menu. Confirming your choice by selecting “Yes”.