I like messing with my main Mail window, since it's one of very few always-open windows on my MBA. For me, a priority is viewing a good quantity of messages without needing a large window, and keeping it relatively clean. Thus, I prefer the Column layout, and right now have 18pt Arial Narrow as my Message List font. I also have rules set up to set the color of the mail from each of three accounts, to keep them easily differentiated in the list. (That capability in a unified Inbox is what keeps me faithful to Mail even though I've tried many other apps.)
Any other set-ups to recommend?
Any other set-ups to recommend?