Get a Mini Membership site to attract more Subscribers.Give your audience Private Content read access when they sign up.Read installation instructions first.
The Whitelist plugin enables you to open your website to a set of users and blocks everyone else. You can enter users by their email address into the Whitelist tab of the plugin. Once done, only users on the list would be able to visit your site.
Create posts that will only be displayed (and included in blog and search listings) for logged in members. Just add the special category Members Only to any post not to be shared publicly. Includes Members Only sidebar widget and Site News widget (all posts not in Members Only category)