Wanted: Email Stats Plugin

As I was doing my best today to not check email and actually program I thought about something that I would be intersted in using. Heck, I might even be willing to pay $5 for something of this nature. The software that I’m looking for is a software plugin for Mail.app that would give me stats on my email activity. Things I’d like to track are: Number of messages received in a given time period/li>