Rui CarmoLetterbox is a plugin for Apple's Mail.app that takes advantage of your widescreen monitor. It rearranges the interface into three vertical columns --so the message pane is to the right of the message list, rather than below:
Letterbox is a plugin for Apple's Mail.app that takes advantage of your widescreen monitor. It rearranges the interface into three vertical columns --so the message pane is to the right of the message list, rather than below: