Can I make the UI text on iPhone/iOS smaller? I have pretty good eyes, and I'd like to be able to see more than 5 emails at a time in the list view. I realize I can reduce the number of preview lines, but I want to keep the preview and just make everything smaller. Seriously, the from labels are huge.
Sorry, but no. As of iOS 5, there's no method for the user to adjust font/interface sizes unless the app gives you a specific control for it. iOS Mail does have a setting for minimum font size, but it only applies to the body of the message, not the message lists.