Tired of viewing your Mail messages on the bottom of the window? There are ways of moving it elsewhere.
Letterbox lets you place the preview pane on the right or bottom (Mail’s default setting) of the message list. You can also configure it to show or hide alternate row colours and show or hide line dividers between rows. And you can choose the look of the preview pane divider—normal or hairline.
With Letterbox or WideMail you can put the preview pane on the right side of the Mail window.
WideMail has a few more options. As with Letterbox you can choose to show the preview pane to the right or bottom but you can also choose to show or hide relative dates, change the grid style (so it shows vertical or horizontal lines—or both), change the colour of those grid lines, and alter the spacing between cells (from 0 to 20).