Rated 3 out of 5 stars
If this had icons for mail, it would be an improvement.
Although the only thing that keeps me from using this on a daily basis is that the borders are too wide. Like the border between the icon barr and the menu bar, or the border between the tab bar and the content area. Or the border between the different areas of the mail window.
The borders are exactly the same as they are in the preview image aren't they? So why 3 stars? Anyway, I made this for me, I don't give a damn if you don't like it.