DNS & Email Trust
low Severity
Free Check
Reverse DNS / PTR Record Verification
Checks whether outbound web and mail server IP addresses have matching Forward-Confirmed Reverse DNS (FCrDNS) pointers.
Why It Matters
Lack of PTR records causes email delivery to fail anti-spam filters and indicates amateur server infrastructure.
How We Check This
We perform a reverse IP lookup for PTR records and forward lookup the resulting hostname to verify match.
How to Fix & Implement
Copy-paste configuration blocks tailored for your web server or edge proxy.
nginx snippet
# Set PTR record in your cloud hosting provider console (AWS Route53, DigitalOcean, Hetzner)
Frequently Asked Questions
What is FCrDNS?
Forward-Confirmed reverse DNS means IP -> Hostname and Hostname -> IP point to each other symmetrically.