Level: Intermediate
A PTR record maps a sending IP address back to a hostname, and its presence and consistency are checked by nearly every major receiving provider as a basic legitimacy signal.
PTR Records Answer "Who Owns This IP"
Where a standard DNS record resolves a domain name to an IP address, a PTR record does the reverse, resolving an IP address back to an associated hostname.
Missing or Mismatched PTR Records Raise Red Flags
A sending IP with no PTR record at all, or one that doesn't reasonably correspond to the sending domain, is treated with heightened suspicion by many receiving mail servers.
PTR Records Are Configured Through Your Hosting or IP Provider
Unlike standard DNS records managed through your domain registrar, PTR records are typically configured through whoever controls the IP address itself, often your hosting or email service provider.
Next step: Use the Reverse IP Domain Checker to check the current PTR record and reverse DNS setup for your sending IP address.