Configure Reverse DNS (rDNS)
This guide shows how to set the Reverse DNS (rDNS) entry — the hostname assigned to an IP address — for your server IPs in the Server4You PowerPanel. A correct rDNS record is essential for mail servers so that outgoing emails are not flagged as spam.
What is Reverse DNS?
In a standard DNS lookup, a domain name is resolved to an IP address — for example mail.example.com → 1.2.3.4. Reverse DNS does the opposite: it maps an IP address back to a readable hostname.
While this may sound purely technical, it has a very real impact: many email providers and anti-spam systems automatically check whether the sending server has a valid rDNS record. If it is missing or does not match the hostname, emails are often delivered straight to spam — or rejected entirely.
Accessing the rDNS Editor
You can manage the rDNS records for your server's IP addresses directly in the PowerPanel:
Editing an rDNS Record
To assign a custom hostname to one of your IP addresses, follow these steps:
mail.yourdomain.comResetting an rDNS Record
To restore the default rDNS value for an IP address, simply click the reset icon next to the entry. The hostname will automatically revert to the server's default value.
Important — Forward DNS must be set first: Before saving an rDNS record, a valid A record must already exist for the hostname you want to use, pointing to the same IP address. For example, if you want to set the rDNS for 1.2.3.4 to mail.yourdomain.com, the A record mail.yourdomain.com → 1.2.3.4 must already be active. Without this, many mail systems will treat the rDNS entry as invalid.
Having trouble with your rDNS record?
If your changes are not working as expected or you need further assistance, our support team is available via the PowerPanel ticket system.