How to disable JetPack email notification of new posts to Subscribers?
Here is how to add a checkbox option to every new post of whether or not to email the post to Jetpack subscribers. It is excellent feature but not available anywhere on JetPack front-end settings.
2.Add the following code and that’s it!.
add_filter( ‘jetpack_allow_per_post_subscriptions’, ‘__return_true’ );
A sample from my website