By default, system emails come from a no-reply email address. This type of email address can sometimes be marked as spam depending on each individual user's spam settings.
First, check your spam folder for any messages regarding your application. If you do have a message in your spam please mark the message as valid in your main client and white list or allow the email address the message is coming from.
If you are still not receiving email notifications from the system please contact the school or district you are applying to.