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How to Use an OVH Email Address with Microsoft 365 Business

Maira Mehtab Sep 22, 2026 868 views

Question details

The user needs to configure their Microsoft 365 Business subscription to use a custom OVH email domain instead of the default Microsoft-provided address.

Product: Microsoft 365 Business
Device & OS: not provided
Scenario: Setting up professional business email using an existing custom domain after purchasing a new Microsoft 365 Business subscription.
Observed behavior: The user currently has a default onmicrosoft.com address and wants to replace it as their primary address with their registered OVH custom domain.

Before you start

Ensure you have administrator access to both your Microsoft 365 Admin Center and your OVH domain management control panel to successfully modify DNS records.

Solution 1Recommended

Add and Verify Your OVH Domain in Microsoft 365

Configure your DNS records in the OVH control panel to route your domain's emails through Microsoft 365.

To use your custom domain with Microsoft 365, you must first prove ownership of the domain by adding a specific TXT record to your domain registrar (OVH). Once verified, you will need to point your MX (Mail Exchanger) records to Microsoft 365 to ensure emails are delivered to your new inboxes.

Add domain to Microsoft 365

Log in to the Microsoft 365 Admin Center, navigate to 'Settings', select 'Domains', and click on 'Add domain'. Enter your OVH custom domain name.

Get verification records

Select the option to add a TXT record to your domain's DNS records. Microsoft will provide a specific TXT value.

Update OVH DNS settings

Log in to your OVH control panel, navigate to your domain's DNS Zone, and add the TXT record provided by Microsoft. Save the changes and return to the Microsoft 365 Admin Center to click 'Verify'.

Configure MX records

Once verified, Microsoft will provide MX, CNAME, and additional TXT records. Add these to your OVH DNS Zone to correctly route your emails and set up spam protection.

Set primary email address

In the Microsoft 365 Admin Center, go to 'Users', then 'Active users'. Select the user account, click 'Manage username and email', add the newly verified custom address, and set it as the primary email address.

Domain Registration: You do not need to transfer your domain to Microsoft. The domain itself can safely remain registered with OVH while utilizing Microsoft 365 for email services.

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Frequently Asked Questions

Do I have to migrate my website hosting to Microsoft 365?

No. You only need to update your MX and specific TXT/CNAME records for email purposes. Your website hosting and domain registration can remain exactly as they are with OVH.

What happens to the default onmicrosoft.com email address?

Your default onmicrosoft.com address will remain attached to your account as an alias. You will still receive any emails sent to it, but your outgoing emails will now display your professional OVH custom domain.

How long does it take for the new OVH DNS records to work?

DNS changes can sometimes take anywhere from a few minutes to 48 hours to fully propagate across the internet. However, Microsoft 365 typically detects the updated records from OVH within an hour.

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