Email Meter is a tool that pulls your email data every month and sends you a report with analytics and detailed statistics. Email Meter is developed and maintained by ShuttleCloud, a software platform that powers consumer email migration solutions for several large enterprises, including Google, Comcast, Yahoo and TWC.
My BD team and I use email meter for better timing when reaching out to prospects. It also gives us a lot of great personal metrics like response time that helps us see what we need to improve. Great tool, would recommend to any email marketer.