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You can edit the tint color the navigationbar, and even add a custom image to it, but you can not push your own buttons to the MFMailComposeViewController.
Important The mail composition interface itself is not customizable and must not be modified by your application. In addition, after presenting the interface, your application is not allowed to make further changes to the email content. The user may still edit the content using the interface, but programmatic changes are ignored. Thus, you must set the values of content fields before presenting the interface.