What's the Scam?

To subscribe to my monthly email newsletter, you have to enter your information on the webpage, and then reply to an automatically generated email. This is, of course, to prevent people from subscribing addresses other than their own. Starting last weekend, I have been receiving a lot of individual responses to those emails. Always one line: Thank you for the positive impact your emails have had on my life. Your emails are a game-changer. Your emails are a constant reminder of why I subscribed. Your emails rock. Thank you for the time and effort you put into creating these informative emails...