> ## Documentation Index > Fetch the complete documentation index at: https://docs.gcore.com/llms.txt > Use this file to discover all available pages before exploring further. # Set up a PTR record A PTR record maps an IP address to a domain name — the reverse of an A record. PTR records are required for outbound email servers: incoming mail servers often reject messages from IP addresses without a matching PTR record, treating the absence as a spam signal. ## Set up a PTR record In the left-side menu, navigate to **Virtual private servers** or **Dedicated servers**. Select the checkbox next to the server and click **IP addresses**. Virtual private servers list with the IP addresses button highlighted in the toolbar Dedicated servers list with the IP addresses button highlighted in the toolbar In the window that opens, select the checkbox next to the IP address and click **Edit**. IP addresses list with the IP address selected and Edit button highlighted Enter a domain name in the **Domain** field and click **Ok**. The PTR record is created automatically. Domain field in the IP address settings