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Find the name behind an IP address and check that the name points back to the same address: the forward-confirmed reverse DNS that mail receivers expect from sending servers.
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Gmail, Yahoo and most large receivers expect a sending IP to have a PTR record whose name resolves back to that IP. Mail from an IP without it is often rejected or sent to spam. This check reads the PTR record from a public resolver, then resolves each name it finds and compares the addresses. A lookup that does not answer is reported as not read, never as a mismatch.
To see the mail servers of a domain with their reverse DNS, use the MX Lookup.
A DNS record that maps an IP address back to a host name. It lives under in-addr.arpa (IPv4) or ip6.arpa (IPv6) and is set by whoever controls the IP block, usually the hosting or cloud provider, not in your own domain's DNS.
Forward-confirmed reverse DNS: the IP has a PTR record, and the name in it resolves (A or AAAA) back to the same IP. It shows that whoever controls the IP also controls the name.
In your hosting or cloud provider's panel, usually under the server's network or IP settings (often called reverse DNS or rDNS). Set it to a name you control, and make sure that name has an A/AAAA record pointing back to the IP.
No. It only reads public DNS. A matching PTR is one of several things receivers check, alongside SPF, DKIM, DMARC and the IP's reputation.
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