Protected posts being shown in emails to subscribers!! Please Help

Ok, so I have several different subscriptions, all of them one time payments. The issue I'm having is the site is sending an email out everytime i post something new, and you can read a good bit of the protected content in that email. Obviously all users of my site don't have the same membership privileges, and it is even being sent to users who were subscribed when the site was free a few years back. Can someone tell me how to stop these automatic emails from going out? Or at least making it so they won't show the content of the post in them at all?