Most desktop email clients like Outlook and Thunderbird have review that let you see what's in a message without opening it. Now you can have the same thing in your Gmail webmail. Go to your settings, then look in Labs for Preview Pane. Select Enable. You'll then see a toggle button at the top right corner of your messages.
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Preview Pane (Gmail) - Add a preview pane to Gmail webmail
firstname.lastname@example.org (Barry Mahfood)
Sat, 20 Aug 2011 21:17:05 GMT