Question: how do i block delete emails on my ipad?
Answer: go into your “Mail” app.
go to the “Inbox”
click on the “Edit” button.
select the first email so it now has a check mark beside it.
with one finger press on the “Move” button. ... 
WAIT (if you have a lot of emails, your iOS device will appear to be frozen for a few minutes)
then click on the “Trash”