Hello,
I use the service desk, I add specific people to request participants automatically using custom workflow, and I use automation for notifying them. so here the deal if for example, I send an email to my SD I receive the same email notification as request participant, in the automation I selected to send an email to customers involved and to exclude the person who caused the action, in a reporter I don't want to receive that email, all notifications on SD are disabled except public comment added, and notification scheme is 0 nobody gets nothing.