Reverse DNS (PTR) Records & Forward-Confirmed Reverse DNS (FCrDNS) Explained
Z
Published by ZodHost Engineering Team
Executive Summary & Key Takeaways
Learn why missing or misconfigured Reverse DNS (PTR) records cause immediate email rejection by Gmail and Outlook, and how to configure FCrDNS.
Why Mail Servers Require Forward-Confirmed Reverse DNS
When an SMTP server connects to Google Mail, Gmail executes a Reverse DNS lookup on the connecting IP to verify that the IP resolves back to the hostname declared in the SMTP HELO / EHLO handshake.
Tags:
#Reverse DNS PTR
#FCrDNS mail server
#PTR record setup
#mail server IP reputation
#SMTP deliverability
Ready to deploy high-performance hosting?
Get ultra-fast PCIe Gen4 NVMe storage, 99.9% uptime SLA, and free 1-click SSL.