Why do I need revDNS (PTR) record

If you have, for example Ubuntu 20.04 droplet on DigitalOcean, used to host a WordPress using localhost MTA to send mail notifications, you need to set up a Reverse DNS record to make sure your emails are delivered.

Usually the outgoing emails from the hosted sites are being rejected or marked as spam by many mail servers.

Additionally, if the A DNS record for the droplet (VM) is not hosted on Digital Ocean, but on a third party DNS hosting service, you don’t have to move it to DigitalOcean.

How to setup a Reverse DNS (PTR) record for my droplet

The Reverse DNS is configured automatically from our end based on the droplet’s hostname.

To rename your droplet via the control panel

  1. Login to the Digital Ocean Control Panel
  2. Go to Droplets –> Click the droplet you want to rename
  3. Then, on the droplet detail window, click on the name (on top) of your droplet (you wouldn’t know you could)
  4. Change the name in the entry field and click the check mark

To confirm the settings are correct

  1. From the left menu select Networking
  2. Select PTR records tab

Finally, make sure you also edit your droplet’s hostname internally

  1. Update /etc/hostname file
    • on Ubuntu use sudo hostnamectl set-hostname subdomain.domain.com
  2. Update /etc/hosts file
    127.0.0.1 localhost subdomain
    127.0.1.1 subdomain.domain.com
    
  3. Reboot your droplet (VM) with sudo reboot

Verification

The PTR should be automatically adjusted in few hours due to DNS cache.

Check if it works using host my-public-ip



Comments:

Piotr Kowalski

DEVOPS / ADMIN
WEB DEVELOPER

Hello, I’m an IT professional with over 15 years of experience in providing solutions, architecture and projects in various verticals. I’ve been working with passion in a variety of technologies including Internet and Web Technologies, Automation, Administration, Software Development Operations, Enterprise Solutions, Clusters, Testing and Unix/Linux Administration.

Professionally I have done work for a variety of major organizations including LG, SIEMENS, Sagemcom, Gigaset, Affinegy, KPN, CAT Thailand, France Telecom, Telkom South Africa, Orange Mauritius, VOCUS NZ, TwinLakes and GVTC.

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