What is PTR Record (Reverse DNS)?

Quick Answer

A DNS record mapping an IP address back to a hostname, used by receiving mail servers to verify sender legitimacy.

PTR (Pointer) records perform reverse DNS lookup — mapping an IP address to a domain name. Receiving mail servers check PTR records to verify that the server sending mail has a matching hostname. Missing or incorrect PTR records cause spam filtering. A valid PTR record should resolve to a meaningful hostname (e.g., mail.yourdomain.com), not a generic ISP hostname. MisarMail configures PTR records for all dedicated sending IPs.

Related Terms

Email Deliverability

The percentage of emails that reach the recipient's inbox rather than the spam folder or being bounced.

Sender Reputation

A score assigned by mailbox providers based on your sending patterns, determining whether your emails reach the inbox.

Email Authentication

Technical protocols (DKIM, SPF, DMARC, BIMI) that verify an email's sender identity to prevent spoofing and phishing.

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