Hello, I need to add a domain to the O365 portal [https://www.alitajran.com/add-domain-office-365-tenant/] For now, I only want to add the new domain (TXT record) without migrating MX, autodiscover, or SPF records, but I'm confused about this part. Does this mean that if I only add a new domain to the O365 portal without migrating MX, autodiscover, or SPF records, I will have to change the registry key on all clients? [https://www.alitajran.com/prevent-outlook-from-connecting-to-office-365/] Thank you

Hello, @ fsdg , Welcome to the Microsoft Q&A platform! Based on your description, I understand that you want to add a new domain (TXT record) to the O365 portal without migrating MX, autodiscover, or SPF records ,and you want to know whether you need to change the registry key on all clients to prevent Outlook from connecting to Office 365. According to Microsoft's official documentation, there are three ways to validate a domain after you add a new domain, which you can refer to the following screenshot. For more information about adding a new domain, please click on Add a domain to Microsoft 365 - Microsoft 365 admin | Microsoft Learn for reference. During the process of adding a new domain, there is no “migrating MX, autodiscover, or SPF records” as you mentioned. Can you explain what it refers to? Does it refer to doing something with the new domain you added? If so could you please clarify your requirements? I hope you could get back to me in your free time, it will help to solve your problem faster. If the answer is helpful, please click " Accept Answer " and kindly upvote it. If you have extra questions about this answer, please click " Comment ". Thank you for your support and understanding. Best Wishes, Alex Zhang

O365 verify domain - Microsoft Q&A

Accepted answer

Alex Zhang-MSFT 390 Reputation points Microsoft Vendor

2024-09-18T07:18:33.4566667+00:00

Hello, @fsdg,

Welcome to the Microsoft Q&A platform!

Based on your description, I understand that you want to add a new domain (TXT record) to the O365 portal without migrating MX, autodiscover, or SPF records ,and you want to know whether you need to change the registry key on all clients to prevent Outlook from connecting to Office 365.

According to Microsoft's official documentation, there are three ways to validate a domain after you add a new domain, which you can refer to the following screenshot. For more information about adding a new domain, please click on Add a domain to Microsoft 365 - Microsoft 365 admin | Microsoft Learn for reference.

During the process of adding a new domain, there is no “migrating MX, autodiscover, or SPF records” as you mentioned. Can you explain what it refers to? Does it refer to doing something with the new domain you added? If so could you please clarify your requirements? I hope you could get back to me in your free time, it will help to solve your problem faster.

If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".

Thank you for your support and understanding.

Best Wishes,

Alex Zhang
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fsdg 1,006 Reputation points

2024-09-18T08:55:51.4666667+00:00

Based on your description, I understand that you want to add a new domain (TXT record) to the O365 portal without migrating MX, autodiscover, or SPF records ,and you want to know whether you need to change the registry key on all clients to prevent Outlook from connecting to Office 365.

Exactly. I'm wondering if, by only verifying a new domain on the O365 portal (via TXT record), Outlook clients will start disconnecting, as mentioned in this article

[https://www.alitajran.com/add-domain-office-365-tenant]

fsdg 1,006 Reputation points

2024-09-18T09:05:16.28+00:00

Currently, all mailboxes are on Exchange 2019 on-prem. The planned migration is to O365, and the first step is to verify the domain on the O365 portal. Will Outlook clients disconnect after the verification?

Alex Zhang-MSFT 390 Reputation points Microsoft Vendor

2024-09-19T07:33:07.7433333+00:00

Hello, @fsdg,

Thank you for your prompt and comprehensive reply!

Based on your description, I understand that you want to know if the Outlook client disconnects if you validate the new domain only on the O365 portal (via a TXT record).

According to official Microsoft documentation, adding a TXT record to the Office 365 portal to verify that the new domain will not affect your existing email or other services. This step is primarily for domain validation and will not directly affect existing email streams or client connections. Once your domain is connected to Microsoft 365, you can safely remove it.

For more information, please click on Add DNS records to connect your domain - Microsoft 365 admin | Microsoft Learn for reference.

In conclusion, your Outlook clients should not disconnect just because you verified a new domain on the Office 365 portal. If you encounter any issues, it might be related to other aspects of the migration process rather than the domain verification itself.

If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".

Best Wishes,

Alex Zhang
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