Microsoft 365 Administrator Expert MS-102 Practice Question
Your Microsoft 365 tenant already hosts contoso.com. The company acquires Litware, which uses the public domain litware.com and still delivers all email to an on-premises Exchange organization. You must add litware.com to Microsoft 365 so Litware users can sign in with their existing email addresses, without disrupting current mail flow. Which action should you perform first in the Microsoft 365 admin center?
Start the Add Domain wizard for litware.com and allow Microsoft 365 to automatically update all required DNS records at the registrar.
Create an accepted domain of type Internal Relay for litware.com in Exchange Online.
Create a mail flow connector in Exchange Online that routes outbound messages for litware.com through the on-premises SMTP gateway.
Start the Add Domain wizard for litware.com and select the option to manually add a TXT record for verification only.
The initial step in adding a new custom domain is to prove ownership. In the Add Domain wizard you choose the option to add your own DNS records, then create the TXT record that Microsoft 365 supplies. TXT-based verification does not alter any MX or other service-specific records, so existing mail flow remains unaffected. Allowing Microsoft 365 to update DNS could immediately change the MX record, disrupting mail. An accepted domain in Exchange Online cannot be created until the domain is verified, and configuring a mail flow connector is unnecessary for domain verification.
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Why is TXT record verification necessary when adding a custom domain in Microsoft 365?
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What is the function of an Internal Relay domain in Exchange Online?
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