MailChimp offers great built-in campaign reports, but high-volume senders who are especially concerned with their list size might be looking for more detailed analytics on their lists, as opposed to individual campaigns. This stuff’s important—especially if you’re sending campaigns daily, and your business revolves around email. A closer look at your list’s health can help you understand your subscribers’ behavior and make sense of MailChimp’s campaign reports. What percentage of your list is opening your emails? What about the click rate for your “power users” list? Is the open rate better when you send on Sundays or Mondays? MailChimp Labs created a new app called ListMD to answer these questions and more.