All Users in selected User Group(s)
Sends the message to every active User in the selected User Groups.

Pick one or more User Groups. Selecting All is equivalent to picking every group individually, and applies to any group added to the system after the notification is saved.
One Message Per User
If a User is in more than one of the selected groups, they will receive only a single message.
Active Users Only
Pending, suspended, and locked Users are skipped. Only Users with an active status receive the message.
Compatibility with message types
Available for Email, SMS, and Announcement messages.
Not available for Flash Messages, which only ever go to the current user.
Examples
Use {% skipMessage %} inside the message body to exclude individual recipients at send time.
Skip users who opted out via a custom field
{% if recipient.user.skipNotifications %}
{% skipMessage "User has opted out of notifications." %}
{% endif %}Skip newly created accounts
{% if recipient.user.dateCreated > now|date_modify('-7 days') %}
{% skipMessage "Account is less than 7 days old." %}
{% endif %}Skip users without a specific permission
{% if not recipient.user.can('accessPlugin-notifier') %}
{% skipMessage "User does not have access to Notifier." %}
{% endif %}