This is just a quick heads up. It’s just come to light that since at least 7.04, iOS no longer encrypts email attachments on the local file system as it should do.
By default all apps should have any data they save encrypted as an additional layer of security. But it seems this is currently not happening with the Mail App.
Andreas Kurtz is credited with finding this issue. He has a write up here.
What does this mean? Well to get to the attachments someone malicious would need physical access to your iOS device, jail break it and then put the device into DFU mode. Until Apple fixes this, it’s probably best to take extra care with your devices.