How do you make e-mail notifications for people who subscribe to certain posts?

Greetings everyone, so great to be here for another exciting day of learning!

I was wondering how you'd do it with your WP website to make a post-subscription system. My client has many different post categories and she'd like people to be able to subscribe to receive an e-mail in their mailbox everything a new post in that specific category comes out.

Is there a plugin for that? Maybe in WP configuration itself?

How would you do it?

Thanks a lot!