What Is Reverse DNS?
Reverse DNS (rDNS) maps an IP address back to a hostname using PTR records. It's commonly used to verify mail server identity, troubleshoot network issues, and validate server configurations. Properly configured rDNS is essential for email deliverability.
Why Is Reverse DNS Important?
- Email servers use rDNS to verify the sender's identity and reduce spam
- Helps diagnose network connectivity and routing issues
- Required by many services for security and compliance verification
- Missing PTR records can cause email delivery failures