The Email Users admin action allows Confluence Administrators to send broadcast emails to members of Confluence groups.
Confluence Administrator Only
You need to be a Confluence Administrator to access this functionality
Access the Email Users action from the Administration Console: Community Bubbles > Email Users
You will need to select the group the email is being sent to.
When you click preview you will see the list of individual users that the email will be sent to.
The email is sent to all users in html format, regardless of their personal email settings. You can use basic wiki syntax in the body of the message which will be converted to html when the email is sent.