Application: Letterbox

A great add-on for Mail that I've been using for a while is Letterbox. Letterbox takes the current Apple Mail layout (1 column and 2 rows) and turns it into 3 columns. (See image below.)



This is really nice because when you normally read messages, the mail viewer window is too wide for the message. However, when it's set to 3 columns, the message viewer width is just fine.

After you DUZI Letterbox (Direct download link) go to your Mail.app preferences. Chances are that you'll have to click and hold on the arrow at the far right of the address bar to be able to access the Letterbox preferences.



There are several options here, such as the viewer orientation (the big feature) or alternate line color in the message selector. Browse around and find the best setup for your tastes.

When people were raving about this, I was highly skeptical at first. If you're in the same camp that I was in, then I highly suggest you install it. You can uninstall it later, but odds are you'll love it.

[Letterbox]