My b2evolution Version: 2.4

Hi everyone,
Is there a possibility for users to receive email for new posts from blogs related to the blog they subscribe?

I have my blog 1 linked to blogs 2 to 5, and for the moment when i post on blogs 2 to 5, user registered to articles and commentaries of the blog 1 don't receive mails of notification! They have to register also on blogs 2 to 5?

If you have a solution for simplify it...

Have a nice day!