When sending an email, Package Track uses the email server but the process is initiated in Package Track. For emails to be sent, the program must be running. The timer settings for sending an email (every hour, day, or week) are based on the Package Track program (i.e., Package Track determines if it is time to send the email based upon when the last email was sent).
To notify by email in Package Track, enable email notification, configure your server settings (you need a valid SMTP server, SMTP port, and account; a static IP address for the SMTP server is preferable), check the notify by email option in the recipient record, and enter the email address in the recipient record. Also, the program must be running for the email to be sent.
I am not aware of a separate test available for testing email notification.