Iphone email works but generates wrong return address

Question

I'm using iphone 5 ios7
I can receive and generate email from my iphone to my pop server account.  However, any email I send out has the wrong return addess -- it's missing a digit. 
In settings, when I go to that account, it has the wrong address with a check mark.  But all efforts to add another email, the right one, and put a check next to that to make it the default, have failed.  Correct address simply does not remain on that line once I leave that screen.  

Answer 1

What part of settings are you going to where you see the email address with a checkmark? The return address for your email is set at the beginning and when you create the account. Your best bet is to delete the account and recreate it making sure all settings are correct.
I think I found where you were. When you first go into Settings and then select the account, then look under POP account information and select the email. You need to fix the default, which is the one when you create the account. That is where the error is at. You cannot change the default by adding a new address in that area.
Message was edited by: ChrisJ4203