How to make my email account on my iphone work again?

How can I make my email account on my iphone work again?

Go into your settings and delete the email account you have entered in there. Then re-enter it like you did when you first set it up and it should work again. I have had this happen to me twice now. Also if you change your password on your email account it will not be able to connect to it.

I tried to do so in the morning still not working any other ideas?