Here's a simple idea to improve the SmarterMail user interface for admins. In many places you need to scroll down to see rows that exceed the height of your screen. Unfortunately the heading also scrolls, so now you're looking at a bunch of rows without a label above the columns.

Examples:

The action buttons (New, Delete, ...) also scroll off the screen. So would be nice to freeze those too. Then you could checkmark a few rows and click an action button without having to scroll back to top.