Hi sandy,
In the admin email section, that is for when you email a particular application from the backend. For example, Mr. Lewis applies to a job. This application will be in the ‘Applications’ section, listed with all of the applications thus far made through your site.
You can then select each application using the check box on the left, and in the ‘Bulk Actions’ dropdown there is an option to email.
This will allow you to email Mr. Lewis, (or any other applicant), regarding their application.
Then you would see this sent email in the “Emails” section of the plugin. Right now it says “There are currently no emails in the system” because you have not sent any applicant an email using this feature.
**As far as email notifications (aeusebio is asking as well)**
I am only familiar with how application notification emails are handled, so it maybe different for the job posting notifications.
But they are sent out whenever an application has every mandatory field completed. If a field is missing (such as a checkbox) that is mandatory, the application will still be sent but the email will not trigger.