You can send emails automatically based on changes of status fields.
- Create a status field in your content type (if not present)
- Open the mail or create one for the given content type
- Select the status field
- Select the status‘ value
- Select one of the email fields of this content.
As soon as an item will saved (either by the backend, self service user or by api) and the status value is changed to the given value, the mail template will be send to the recipient in the given email field. Add as many status fields as you want. E.g. send automatic mails on new call for papers applications or attending / not attending answers.