A reverse DNS record (rDNS / PTR) maps an IP address to a hostname. This is especially important for sending email, as many mail servers reject messages without a valid rDNS.

Setting rDNS in the client area

  1. Sign in to the client area
  2. Open your server under "My Services"
  3. Select the "Reverse DNS" menu item
  4. Enter the hostname for the desired IP (e.g. mail.your-domain.com)
  5. Save
Important
The hostname in the rDNS should also resolve back to the same IP via regular DNS (A record) – known as Forward-Confirmed rDNS. Otherwise delivery problems persist.

Verifying

Check whether the record is active:

dig -x YOUR-SERVER-IP +short

The output should show the hostname you set. Changes may take a few minutes to a few hours to become visible everywhere.