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How to Set Up a Squarespace Domain in Microsoft 365

Nimra Malik Sep 28, 2026 869 views

Question details

The user needs to add a custom Squarespace domain to their Microsoft 365 organization while continuing to use their existing onmicrosoft.com domain.

How to Set Up a Squarespace Domain in Microsoft 365

Product: Microsoft 365
Device & OS: not provided
Scenario: Setting up a custom Squarespace domain and managing aliases, forwarding, and user licenses in the Microsoft 365 admin center.
Observed behavior: The user wants to configure DNS verification and email aliases correctly so that both the onmicrosoft.com and the new custom domain function properly.

Before you start

Ensure you have global administrator access to your Microsoft 365 admin center and the login credentials for your Squarespace domain account to update DNS records.

Solution 1Recommended

Add and Configure the Squarespace Domain in Microsoft 365

Use the Microsoft 365 admin center to add your custom domain and verify it using DNS records from Squarespace.

Microsoft 365 natively supports domains registered or hosted with Squarespace. You will need to extract the DNS records provided by Microsoft and publish them on your Squarespace DNS settings pane to prove ownership.

Access Domains in Admin Center

Add the Custom Domain

Click 'Add domain', enter your custom Squarespace domain name, and proceed to the next step.

Copy DNS Records

Choose the option to add your own DNS records. Copy the TXT or MX verification records generated by Microsoft.

Publish Records in Squarespace

Verify the Domain

Return to the Microsoft 365 admin center and click 'Verify'. Once verified, you can set it as your primary domain.

Add and Configure the Squarespace Domain in Microsoft 365

DNS Propagation Time: DNS changes made in Squarespace can take anywhere from a few minutes to 48 hours to propagate fully across the internet before Microsoft can verify them.

Solution 2

Configure Email Aliases and User Licenses

Update user accounts to use the new custom domain while preserving their original onmicrosoft.com addresses as aliases.

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Frequently Asked Questions

Will my onmicrosoft.com emails automatically forward to my new Squarespace domain?

No, emails sent to the original onmicrosoft.com addresses do not automatically move or forward. You must configure aliases or forwarding rules in the Microsoft 365 admin center.

Can I keep my onmicrosoft.com domain active indefinitely?

Yes, you can continue using your onmicrosoft.com domain for as long as your Microsoft 365 subscription remains active, even after adding a custom company domain.

Do I need a paid license for an administrator account?

If the administrator only needs to manage settings, licenses, and security but does not require email functionality or Microsoft 365 applications, you can create an unlicensed administrator account to save on subscription costs.

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