1. Help users to check the email relevancy easily. (To and Cc are different for email context.)
2. Selected information and better readability.
Following the traditional layout for the email details makes the information a bit redundant and scattered.
As users coming to this screen are either from the bubble lists or the thread lists, the users have already known the senders’ names and the times. That’s why I hide the senders’ names and the times at the first view. However, users still have the chances to see them after tapping on the “Details” buttons. And I also redesign the layout which allows users to read the details more fluently.