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This might give you a hint?

http://thehackernews.com/2014/05/ios-apple-iphone-data-prote...

Apple iOS 7 Updates Silently Remove Encryption for Email Attachments Thursday, May 01, 2014

From what I'm reading in other places this seems more like an oversight than malicious intent. It was present in iOS 7, then broke in later versions. The e-mails themselves are still fully encrypted, and the iPhone data itself can be encrpyted, the main trouble seems to be what's transmitted during sync, since the actual researcher[1] claims a valid workaround is simply disabling mail synchronization.

1. http://www.andreas-kurtz.de/2014/04/what-apple-missed-to-fix...

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