How can an ordinary user send a notification to a group of users

[jd]

How can an ordinary user send a notification to a group of users  without having to enter each of the group's individual email addresses? For instance if a user posts a new topic and they might want to notify the rest of the users in the group - but not all users and groups?
Thanks
Jd

[[Unknown]]

If the other people request notification for new posts, the notification will automatically be sent to them.

-[Unknown]

[rmderks]

Hi

How can I force notification to all users?
How can I set the Notification automatically always on?

Thank in advance,

Roy