Jetpack Subscriptions

Hi

I added a Jetpack subscription form to the above website but I wanted to check. Does it subscribe to all sites that Jetpack is connected to or just the single site. The reason I ask is that I run a number of sites and teachers are subscribing to the Fowey Farm site to hear about that work, not everything else. How does Jetpack CRM fit in and is it better to get a site subscription plugin please?

Thanks

Rich

The page I need help with: [log in to see the link]