All I can find is in the "Mail, Contacts, Calendars" section of your Settings app. In there are two lines; one to always show the To/CC lines and the other to "Always BCC."
Maybe you can fix your issue if you mess with one of those areas (or both)?
Marilyn
P.S. I've deleted the other comment you made about this issue. It's easier to keep issues/questions to one thread as it makes it easier to follow. So please, keep any follow-up to this thread. Thanks.