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There is now a drawer which can be opened on every message which includes who the message is from, who the message is to, any cc / bcc recipients, and the date (timestamp) the message was received. The drawer can be opened by clicking on the new expand button next to the sender’s name, or by pressing Command Shift O (you can also close the drawer with the same shortcut). This update makes it much faster to quickly open the drawer, check the details of a message, and then close the drawer once you're done.