iOS’ built-in Mail app for the iPhone and iPod touch has steadily improved over the years, but one thing that hasn’t changed is the number of emails you can see at once—unless you’ve already followed this handy tip. Open up Settings, tap on Mail, Contacts, and Calendars, and under the Mail heading, tap on Preview. From there you can reduce the number of lines devoted to email previews from the default two down to one or even…
