**Removed By Moderator** has a five-star rating system where you can pull up your most avid email readers. Their system looks at all the emails sent, not just the last one. It would be good to send special emails to these hot responders. And **Removed By Moderator** is free. I like Constant Contact, but right now I'm referring my clients to **Removed By Moderator** . They don't need all the bells and whistles of CC, but this hot responder list is a good one.
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