The Mail Message View is as I see it a scroll view with a container, the container again has a header (including the from, date, and subject field) and the content webview.
Now when you zoom in the webview, the header stays at the same place and size.
Is it possible to do a view like this with the public APIs? I see as problem that the UIWebView is not a subclass of UIScrollView, so it's not like a scroll view in a scroll view.