mail; email; help; disappearing mail

My iPhone shows that 3.8 GB is being used; however, almost all of my email folders are empty. (I have a Roadrunner and Gmail account, but the folders are virtually empty.) There's nothing there. Is there a way to purge this phantom data? Also: every time I delete an app, the memory that should...

I received an email in Mail on my iPhone that I soon forwarded to a friend. When I look for the original mail, I cannot find it; however, I can find the mail that I forwarded. When I search for the mail using time sent (to narrow down the number of possible hits), the mail appears for a few...