Register my own domain with microsoft exchange

Question

Register my own domain with microsoft exchange

Robert Esguerra 0

I have my own domain that was linked to Outlook for 15 years. It stopped working last year and I was told that I have to register my domain with Microsoft Exchange

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2 answers

Your answer

Answer 1

Alina Le 5,000 Independent Advisor

Hello Robert,

Based on the information provided, you have been using your own domain with Outlook for approximately 15 years, but the setup stopped working last year, and you were advised that the domain now needs to be registered or configured with Exchange Online.

To help us better understand the situation, could you please confirm the following:

1/ Before the issue started, who was providing email service for your domain?

(A personal Outlook.com account/ A Microsoft 365 business account/ Or another provider?)

-> Also, do you still have access to the company or website where you manage your domain name (for example, GoDaddy, Namecheap, Cloudflare, etc.)?

2/ What happens when you try to use the email address now?

-> Are you unable to sign in, send email, receive email, or add the account to Outlook? If you see any error message, please share the full error or a screenshot (with any personal or sensitive information removed before posting).

User's image

3/ Do you currently pay for any Microsoft 365 or Exchange email service for this domain?

-> Also, do you remember whether the issue started after any change such as moving the domain to a new provider, updating settings for the domain, or changing your Microsoft subscription?

In the meantime, you may also check the following:

Confirm where your domain's email is currently hosted by reviewing the domain's MX records.
If you have access to a Microsoft 365 Admin Center, go to Setup > Domains and check whether the domain is already registered there and whether any health or DNS warnings are reported.

For reference:

Add a custom domain to Microsoft 365

(Explains Microsoft's official process for adding, verifying, and configuring a custom domain for use with Microsoft 365 services such as Exchange Online)

Change your email address to use a custom domain

(Explains how an existing domain can be connected to Microsoft 365 email and what configuration is required to route email through Microsoft 365)

Once you have the details above, you can determine whether this is a domain/DNS issue, a Microsoft 365 configuration issue, or a scenario where the previous Outlook custom-domain setup needs to be migrated to Exchange Online.

Alina Le 5,000 Reputation points Independent Advisor

2026-09-02T15:28:13.6633333+00:00
Hi,

In my first response above, I would like to gather some information first to ensure I fully understand your concern and can provide the most relevant guidance. If anything is unclear or if you get stuck at any step, please let me know, and I will be happy to clarify further.

I would like to continue with the information below:

First, could you please provide the domain name you are trying to use?

(Please share only the domain name (for example, contoso.com) and not the full email address. Based on that information, I can provide more specific guidance.)

In this scenario, to add a domain to Microsoft Exchange Online, you first need to identify the domain provider. After that, you can follow the steps below to add the domain to the Microsoft 365 Admin Center. Please note that you must be a Global Administrator of your Microsoft 365 tenant to perform these steps.

1/ Check the domain registration information using a WHOIS lookup service, such as: https://lookup.icann.org

Find your domain registrar and DNS hosting provider

2/ Identify the domain registrar and DNS hosting provider from the lookup results.

3/ Sign in to the portal that manages your domain's DNS records (for example, GoDaddy, Namecheap, Cloudflare, or your hosting provider), where DNS records can be added or modified.

4/ Sign in to the Microsoft 365 Admin Center: https://admin.microsoft.com

Go to Settings > Domains > Add domain.

Enter your domain name (for example, contoso.com).

Verify domain ownership by adding the DNS record (typically a TXT record) provided by Microsoft.

After verification, configure the required DNS records:

MX (mail routing)

Autodiscover CNAME

SPF TXT

Optionally DKIM and DMARC for email authentication

Create users/mailboxes and assign Exchange Online licenses.

You can watch the video guidance in this article to do it:

Add a custom domain to Microsoft 365

If you encounter any issues during these steps, please return with a screenshot of the exact point where you are stuck. Before posting screenshots on this public forum, please remove or redact any personal or sensitive information.

If you find my reply above helpful, please consider voting it up or marking it as the "Yes" so others can easily refer to these steps if they encounter a similar issue.

I look forward to your update for further assistance.
Alina Le 5,000 Reputation points Independent Advisor

2026-09-07T12:11:31.4933333+00:00

Hi,

Would you like me to continue working through this with you?

Please let me know if you'd like any further assistance.

I look forward to your update.
Robert Esguerra 0 Reputation points

2026-09-07T13:33:04.34+00:00

Still waiting for Go Daddy to give me access to my own domain. Yes I will definitely need help.
Alina Le 5,000 Reputation points Independent Advisor

2026-09-08T01:36:34.15+00:00

Hi,

I will wait for your update and try to continue to support you.

Please paste the screenshots here (with PII removed) showing where you are stuck so I can address it exactly and support you.
Alina Le 5,000 Reputation points Independent Advisor

2026-09-09T15:52:16.78+00:00

Good day

How’s everything going? Is there anything else I can do for you?

Answer 2

To use a personal or business domain with Microsoft 365 Exchange Online, the domain must be added to Microsoft 365 and ownership must be verified before mail can work again.

Sign in to the Microsoft 365 admin center.
Go to Setup > Domains.
Select Add domain.
Enter the domain name and start verification.
Verify ownership by adding the DNS record Microsoft 365 provides. Microsoft supports verification by:
- TXT record
- MX record if TXT cannot be added
- verification file uploaded to the website
After verification, continue the wizard and add the required DNS records for Microsoft 365 mail.

Important points:

Adding, modifying, or removing domains requires the Domain Name Administrator role in a business or enterprise plan.
If the registrar supports Domain Connect, Microsoft 365 can automatically confirm ownership and add required DNS records.
If the registrar does not support Domain Connect, DNS records must be added manually at the registrar.
If email is being moved to Microsoft 365, create users and mailboxes in Microsoft 365 before changing the MX record so mail flow is not interrupted.

If Outlook previously worked with a custom domain and then stopped, also check the domain status in Setup > Domains. If there is an issue, open the domain’s more actions menu and select Check health to see detected DNS or setup problems.

If the goal is specifically to configure Outlook with a custom domain account, Outlook may also require this DNS record for Autodiscover:

CNAME
Host: autodiscover
Points to: autodiscover.outlook.com
TTL: 1 hour

For older Outlook.com personalized domain setups, the MX record also needs to remain pointed to the existing Hotmail-hosted value ending in *.pamx1.hotmail.com.

If the domain cannot be added because it is already attached to another Microsoft 365 organization, it must be removed from the old tenant before it can be added to the new one. If access to the old tenant is no longer available, use Help & Support in the Microsoft 365 admin center to contact support.

References: