Tables in SmarterMail are designed to be dynamic. When a table is displayed, the page determines the minimum width necessary for each column and the available width on the page. Then, working from the left, the page determines how many columns will fit and adds the scrolling. This evaluation is only done as the page loads or when the window size changes.As your screenshot illustrates, this can leave a lot of whitespace as you scroll the table away from the left-most columns.