Stop Posts being emailed

I’m looking for a way to make posts live but not have them sent out to subscribers.

I recently have started a newsletter so that’s where I want people to get those posts – not individually each time I post something to the site.

I have tried Visibility: Public > Visibility: Private > Update = Status: Published > Visibility: Public…..
But people are still receiving the posts. What’s the correct way to do this?