You can send notifications to everyone who joined your Space very easily.
To notify all people in your Space, click on the notify icon (paper airplane) (only administrators can see this).
A window will appear where you can enter a title and message:
Change the "subject line" and enter the information. Click send to send the message and then confirm the sending with OK. Click "close" to finish.
All subscribers will receive an email from you with the subject line you entered, the content in the message, and a link to the Space.
NOTE: Only an Admin can notify members