Does not getting any IP address after publishing MX record for M365 Portal

Question

Dear Expertise,

We are facing an issue with updating the MX record in the Microsoft 365 portal. After publishing the MX record, no IP address is being assigned to it. When we noticed this, we contacted our DNS provider, but they confirmed that they do not see any IP address associated with the MX record and that the issue is not on their side.

To further investigate, we added another additional domain to the same M365 portal, published the MX record, and encountered the same issue. Additionally, we removed the affected domain from the M365 portal and created a new M365 tenant, then added the same domain, but the issue persisted in the new tenant as well.

It is important to note that this is a new M365 tenant without any licenses assigned. However, based on our experience, we have never encountered such an issue due to the absence of licenses.

Has Microsoft changed any policies regarding IP address assignment for MX records in unlicensed tenants?

Could you please advise on how to resolve this issue?

Thank you.

Answer 1

Hello, @Dipto Adhikary,

Welcome to the Microsoft Q&A platform!

Based on available information, Microsoft hasn't recently changed its policies regarding MX record IP address assignments for unlicensed tenants. The MX record points to Microsoft's mail servers (for example, mail.protection.outlook.com), and due to dynamic load balancing, you might not see a static IP when you query it. Verify that the domain is fully verified, and the MX records are configured correctly in the Microsoft 365 admin center, matching the required format and values, as DNS changes can sometimes take up to 48 hours to propagate.

If the issue persists, use the domain health check feature in the Microsoft 365 admin center to help identify any configuration problems. Although your DNS provider confirmed there are no issues on their side, double-check all settings, and consider testing by applying a license to a user account to confirm mail routing.

Here are official documents for your reference:

1.Find and fix issues after adding your domain or DNS records - Microsoft 365 admin | Microsoft Learn

2.Add DNS records to connect your domain - Microsoft 365 admin | Microsoft Learn

Should you need more help on this, you can feel free to post back. 

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Thank you for your support and understanding.

Best Wishes,

Alex Zhang