I think you're on to something. There are a few sites that let you run newsletters (Constant Contact is one I've used) but they are just terrible to use. I thi

I think you're on to something. There are a few sites that let you run newsletters (Constant Contact is one I've used) but they are just terrible to use. I think you're going to find out pretty quickly you'll need to charge though, especially if you want any of your emails to actually get delivered. That's a non-trivial problem and involves actual labor to prevent spammers from using the service. Just making someone verify their identity by putting in a credit card will help a lot.