Mac Mail.app (Yosemite) - preview pane on right WITHOUT individual message previews on left
In Yosemite (I'm on 10.10.1) I can do the following:


Mail > Preferences…
Viewing Tab

Uncheck "Use classic layout"
Uncheck To/CC label in message list
Uncheck Contact photos in message list
List Preview: None



In my toggling of options, the message pane itself disappeared. However it was made available via a grab handle at the right edge of the screen. I now have a message list showing me no previews and a message pane to the right of that.