How to add a PTR record for mail delivery to my azure VM

Hello, Welcome to MS Q&A

Requirements

• Static Public IP: Reverse DNS is only supported on static public IP addresses in Azure.
• Matching Forward DNS: The hostname you configure must resolve back to the same public IP (via an A or CNAME record).
• Azure CLI or PowerShell: The property cannot be set in the portal UI.

So pls tyr use this PS Script to achieve this

# Login to Azure
Connect-AzAccount

# Get your public IP resource
$publicIP = Get-AzPublicIpAddress -Name "MyPublicIP" -ResourceGroupName "MyResourceGroup"

# Set the ReverseFqdn property
$publicIP.DnsSettings.ReverseFqdn = "mail.example.com."

# Update the resource
Set-AzPublicIpAddress -PublicIpAddress $publicIP

Kindly check and let me know if any ques

Thanks
Deepanshu

Hello @Edhy Rijo,

Thanks for reaching out to Microsoft Q&A.

It looks like you need to set up reverse DNS (rDNS) for your mail server hosted on an Azure VM, specifically by adding a PTR record to your public IP. Here’s a quick guide on how to achieve that:

Setting up a PTR record for Reverse DNS on Azure.

1. Create a Reverse DNS Zone: Azure uses the in-addr.arpa domain name for IPv4 reverse DNS lookups. Ensure you have a DNS zone created for your public IP range.
2. Add the PTR Record:
   • Go to the Azure portal and navigate to your DNS zone.
   • Click on Record sets and then select +Add.
   • For the Name field, enter the last octet of your IP address (for instance, if your IP is 192.0.2.15, you enter 15).
   • For Type, select PTR.
   • For Domain name, enter the fully qualified domain name (FQDN) of your mail server.
   • Click Add to create the record.
3. Setting the ReverseFqdn Property (for Public IP): You might also need to set the ReverseFqdn property on your Public IP resource, especially if you are using Microsoft-owned domain zones. Here’s how to do that:
   • Use Azure PowerShell or Azure CLI to set the ReverseFqdn.
   • Here’s an example using Azure CLI:

          az network public-ip update --resource-group <yourResourceGroup> --name <yourPublicIpName> --reverse-fqdn <yourFqdn> 
     

Reference documents:

Create a DNS PTR record

Configure Reverse DNS for SMTP service
Host Reverse DNS lookup zones in Azure DNS

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