In Mail, can preview pane be made narrower?
A number of emails I receive are too wide to fit onto my screen even if I reduce the font size by means of the 'Smaller' button in the toolbar. But the preview pane on the left is wider than necessary; if I could make it narrower, it would improve the fit of the message pane on the screen. Is there a way of doing this?
Mac mini, OS X Mountain Lion (10.8.5)