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How to Add PTR Records for Microsoft 365 Email Domains

Emma Brown Oct 9, 2026 869 views

Question details

The user needs to know how to add or manage PTR (reverse DNS) records for their Microsoft 365 email domains, typically to meet external email sender guidelines.

How to Add PTR Records for Microsoft 365 Email Domains

Product: Microsoft 365 Exchange Online
Device & OS: not provided
Scenario: Setting up reverse DNS to improve email deliverability and comply with strict sender guidelines from major email providers like Google.
Observed behavior: Customers find they cannot create or manage PTR records directly for Microsoft's shared outbound email IP addresses within the Microsoft 365 admin center.

Before you start

Determine whether you are sending emails through standard Microsoft 365 shared IP addresses or using your own dedicated Azure-hosted IP addresses, as this changes how reverse DNS is handled.

Solution 1Recommended

Contact Your Service Provider for Microsoft 365 IPs

Use this approach when utilizing standard Microsoft 365 outbound email IPs, as Microsoft owns the IP ranges and manages the reverse DNS automatically.

PTR records must be created by the organization that owns the IP address subnet. Because Microsoft owns the IP ranges for Microsoft 365 outbound emails, customers cannot add PTR records directly.

Microsoft automatically maintains the appropriate reverse DNS configurations for its shared IPs to ensure compliance with major email providers.

Verify Email Authentication Records

Instead of focusing on PTR records, log in to your Microsoft 365 Admin Center and ensure your domain's SPF, DKIM, and DMARC records are correctly published in your DNS hosting provider.

Contact Microsoft Support

If your emails are still being rejected for reverse DNS issues, open a support ticket in the Microsoft 365 Admin Center by navigating to Support > Help & support.

Contact Your ISP

If you route mail through an on-premises Exchange server or a third-party gateway before Microsoft 365, contact your Internet Service Provider to configure the PTR record for your specific IP address.

Contact Your Service Provider for Microsoft 365 IPs

Automatic Compliance: Microsoft generally ensures its shared outbound IPs have proper reverse DNS to comply with Google and Yahoo sender requirements. Proper SPF and DKIM setup is usually enough to guarantee delivery.

Solution 2

Configure Reverse DNS via Azure DNS

If you are using Azure-hosted resources with dedicated IP addresses, you can manage your own reverse DNS directly through Azure.

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Frequently Asked Questions

Why can't I add a PTR record directly in the Microsoft 365 admin center?

PTR records, or reverse DNS records, are managed by the entity that owns the IP address block. Since Microsoft owns the outbound email IPs for Microsoft 365, individual customers do not have the administrative rights to add PTR records for those specific IPs.

Will my Microsoft 365 emails be rejected by Gmail if I don't set a PTR record myself?

No. Microsoft automatically manages the reverse DNS for its shared outbound email IP addresses to comply with strict sender guidelines from providers like Google. As long as your domain's SPF, DKIM, and DMARC records are configured correctly, your emails should be accepted.

How do I manage reverse DNS if I use my own dedicated IP in Microsoft Azure?

If you use Azure-hosted resources with your own dedicated IP addresses, you can configure reverse DNS by creating a reverse lookup zone and adding a PTR record manually through the Azure Portal's DNS settings.

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