Compatible with iOS 4, 5 and 6
AnyAttach is a tweak that enables you to attach arbitrary files to your emails right from inside MobileMail. It comes with a file and photo/video picker that is accessible via the paper clip button that will be added to the subject bar in the mail compose window.
Dropbox support is enabled by default. It can be disabled using Preferences.app -> AnyAttach
You can configure the AnyAttach settings using the Preferences app.
See all the Screenshots below