Notification for when a post is made

Hello.
I'm wondering if there is an option where you can give every member on your forum a notification from a post.

Example:
Someone makes a very important post that everyone should see, so give every a notification about the post.

Of course, this should be an option for when you make the post.

There is not an option for that, but each member can do it themselves.  They can watch individual topics or whole forums.