I started a wordpress.com site. Got some subscribers. Then went to a self-hosted site and imported those subscribers with an import plugin. They are now registered users according to Subscribe2 plugin. Not one of them receives an email notification when a new post goes up. The people who do receive email notifications are the ones that have followed me since the move, called Followers according to Jetpack. Is there a way to get my imported subscribers to be followers on the new site?