If you can no longer check your email or are having difficulty checking your email, reading, or deleting email using your iPhone or iPad and it is running iOS 7 or higher, please see this discussion from Apple's forums
Please note, PBHS suggests that you contact Apple Support before trying any suggested fixes you may find. PBHS is not responsible for any content reflected on Apple Discussion Boards and will not be held responsible for any damages or lost data (regarding email).
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