What is a PTR (Pointer) record?
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You send an email, and the receiving server's first move is to look up your sending IP. Not your domain name. Your IP address. It wants to know: does this IP belong to someone who's set up their infrastructure properly, or does it look like a random machine firing off spam?
That lookup relies on a PTR record (short for Pointer record). It's the reverse of a normal DNS lookup. A regular DNS lookup takes a domain name and returns an IP address. A PTR record does the opposite: it takes an IP address and returns a hostname. That's why this is also called reverse DNS.
So if your sending IP is 192.0.2.1, a PTR record would map that back to something like mail.tidalmail.com. Receiving mail servers run this check automatically, every time.
Why does this matter for email? Spam filters treat a missing or generic PTR record as a red flag. If your IP resolves to something like pool-192-0-2-1.provider.net, that looks like a residential or dynamic IP, exactly the kind of address bulk spammers use. A clean, meaningful PTR record (one that points to a real mail server hostname) tells receiving servers you've done the work to set up legitimate infrastructure.
The gold standard is something called FCrDNS (forward-confirmed reverse DNS). That means the PTR record points to a hostname, and when you look up that hostname in forward DNS, it points back to the same IP. It's a loop that confirms everything checks out.
Who controls your PTR record? This trips people up. PTR records are controlled by whoever owns the IP address, not you. That's usually your hosting provider, your ISP, or your ESP. You can't set a PTR record yourself through your domain registrar like you would an SPF or DMARC record. You have to ask your IP provider to create or update it for you.
If you're sending through a shared ESP like Postmark or Twilio SendGrid, they've already set PTR records on their shared IPs. If you're on a dedicated IP (or running your own mail server), that's when you need to get this sorted with your provider directly.
Not sure if your sending IP has a valid PTR record? You can check your full email header setup with our free Email Header Analyzer, which will surface missing or mismatched reverse DNS entries fast.
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