This issue is usually easy to resolve. On the Config Monitor page there are 5 fields. All must be populated. Below you can see how one of our test systems is configured. The admin email must be valid and the SMTP server as well. The Appliance From Address must be a valid format, but does not need to be a real email address. Choose something that will be easily identifiable in your Inbox. Leave Re-check time at 10. I've never found a reason change it. The DNS Test Query must be filled with an address that can be resolved by your DNS server. The common problem is that this field is not populated. You can use any Fully Qualified Domain Name you'd like, as long as it's resolvable.