How to send email to all members when a post is updated by user?
EVENT

After saving new content    

CONDITIONS

Entity is group content

Parameter: Entity: [node]

ACTIONS

Get group members from group audience
Parameter: Group content: [node]
Provides variables: Fetch a List of group members (group_members)

Loop
Parameter: List: [group-members]
List item: Get list of group members and their email ids (list_grp_members_emails)
 

Send mail Parameter: To: [list-grp-members-emails:mail], Subject: Notification: Content..., Message: Test