First, I use Header Panel to mean the display panel with some message details just above the message display window, i.e. From:, To:, Message Title:, etc. There are four lines with lots of empty space. It reduces the amount of message display considerably. I'd be happy with two lines - From: + icon buttons on line one, and To: + Message Title on line 2. If this can be done, Great!. If not, please pass this on as a suggestion for future revisions.