What Is rDNS Validation and Why It Matters for Email Deliverability
rDNS validation is the process of checking whether a sending IP address has a correct reverse DNS record, also called a PTR record, and whether that PTR hostname resolves forward to the same IP. Mailbox providers use this check to decide whether a server looks legitimate, misconfigured, or risky. If you send email from a domain, an outreach platform, a dedicated IP, a self hosted mail server, or a cloud SMTP service, rDNS validation is … Read more






