Unknown results within Infrastructure's Sender rDNS feature indicates Everest was unable to resolve the reverse DNS (PTR) record of the associated IP address.
- There was a DNS lookup failure (not uncommon).
- You do not have a reverse DNS record.
- Your domain is potentially being used to send junk mail.
Ensure your reverse DNS record is configured correctly and monitor the results. If you continue to receive Unknown results, submit a request to Validity Support.