Torna alla DocumentazioneWhat is Reverse DNS?
Reverse DNS (rDNS or PTR record) does the opposite of normal DNS: instead of translating a name to an IP, it translates an IP to a hostname.
It's especially important for servers that send email: many mail servers reject emails if the sender doesn't have a correctly configured PTR record.
How to Check the Current PTR Record
# From the server
host SERVER_IP
# With dig
dig -x SERVER_IP
# With nslookup
nslookup SERVER_IP
How to Configure Reverse DNS
The PTR record is managed by the IP provider (that's us), not by your domain registrar.
To configure it:
The name you enter in the PTR must correspond to an A record pointing to your server's IP. In other words, mail.example.com must resolve to your server's IP.
- Access your client panel
- Select your server or your IP
- Look for the Reverse DNS or PTR Record section
- Enter the desired hostname (e.g., mail.example.com)
- Save
Recommended Configuration for Email Sending
If your server sends email, configure the PTR so it matches your mail server's hostname. Example:
- Server IP: 1.2.3.4
- PTR record: mail.example.com
- A Record: mail.example.com → 1.2.3.4
Email Configuration Verification
You can test whether your IP is blacklisted or your PTR is correct with these tools:
- MXToolbox: blacklist and PTR check
- mail-tester.com: comprehensive email configuration test
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