I guess the must be a connection between HR / Recruitment / Application / Refuse button and Server Action to send email on Refuse button click. Or maybe there's other way to do this action? There's no Workflow for Recruitment to associate the refused stage with Server Action.
I know it's been a long time ago, but am currently facing the same problem.
1. How do I connect the Refuse button to call the action?
2. When I made the Send Email action, the email is not being sent straight away. If I go to Technical -> Emails, the email is in the list and there is a "Send Now" button for it.