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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.

What's New

Version 0.24b9:
  • This version of Letterbox is compatible with Mac OS X 10.6.7 and the build of Mail on new MacBook Pros.
  • Still incompatible with some Mail plugins that also use Sparkle for auto-updating.
  • The two-line combined From/Subject column doesn't play well with fonts other than Helvetica and Lucida Grande.
  • Changing the preview pane position with the menu item or more...


Mac OS X 10.6 or later

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Current Version (0.x)


Downloads 125,662
Version Downloads 50,622
Type Internet / Email
License Free
Date 05 Mar 2011
Platform Intel 64 / OS X / Intel 32
Price Free
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