How to truly properly delete emails on iPhone iPad iPod

How to set up your email app so emails truly get deleted from iPhone 5S iPhone 5C iPhone 5 iPhone 4S iPhone 4 iPhone 3GS
iPad 1 iPad 2 iPad 3 iPad 4 iPad retina display iPad mini iPad air , iPhone 6 plus, iPhone 6, ios8.3, iOS 8, iOS 8, ios7
How to truly delete emails
how to make sure emails are deleted from iphone
how to set up email so emails get deleted and not archived
Trash emails
iOS 7 iphone 6 iphone 6 plus ios8