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rDNS (Reverse DNS) maps an IP address back to a hostname — the opposite direction of a standard DNS lookup, which maps a domain name to an IP address. It's stored in what's called a PTR (Pointer) record. Mail servers commonly check that a sending IP's PTR record resolves to a hostname consistent with the sending domain, a practice known as Forward-Confirmed Reverse DNS (FCrDNS), before deciding how much to trust an incoming message.

Why It Matters for Email

An IP with no PTR record, or one pointing to a generic hosting hostname unrelated to the sending domain, looks less trustworthy to spam filters than one with a matching, properly configured reverse DNS record.

Who Sets It

Because rDNS is tied to IP address ownership, the hosting provider that owns the IP block typically configures the PTR record on request from the customer using that IP.

Frequently Asked Questions

Is rDNS the same as a PTR record?

Yes, "rDNS" describes the concept and "PTR record" describes the specific DNS record type that implements it.

Do I need a dedicated IP to set custom rDNS?

Yes, since rDNS is configured per IP address, you need a dedicated IPv4 address you control.

Is rDNS enough for good deliverability on its own?

No, it's one piece; SPF, DKIM, DMARC and a clean sending history all contribute alongside it.

Does VPS For Life offer custom rDNS?

Yes, custom PTR records matching your sending domain can be configured by our support team.

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