The correct answer is to add an MX record pointing to contoso-com.mail.protection.outlook.com. This DNS record for email routing is essential because it tells the internet’s mail servers where to deliver messages addressed to your custom domain, directing them to Exchange Online’s mail protection service. On the Microsoft 365 Administrator MS-102 exam, this question tests your understanding of the post-verification step: after proving domain ownership with a TXT record, you must configure the MX record to actually enable mail flow. A common trap is confusing the verification TXT record with the routing MX record—remember, TXT proves you own the domain, but MX makes the email flow. Memory tip: think “TXT to trust, MX to move.”
MS-102 Deploy and manage a Microsoft 365 tenant Practice Question
This MS-102 practice question tests your understanding of deploy and manage a microsoft 365 tenant. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Your company has a Microsoft 365 tenant with a custom domain (contoso.com). You need to verify domain ownership before enabling email routing. Which DNS record type should you add?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Add an MX record pointing to contoso-com.mail.protection.outlook.com.
Option C is correct because when you add a custom domain to Microsoft 365 and need to enable email routing, you must prove domain ownership and configure mail flow. The MX record with the value 'contoso-com.mail.protection.outlook.com' is the specific record that Microsoft 365 requires to route incoming email for your domain to Exchange Online. This record is added after domain ownership is verified (usually via a TXT record), but the question asks which record type enables email routing, which is the MX record.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Add a TXT record with the verification code.
Why it's wrong here
TXT records are for domain verification, not email routing.
✗
Add a CNAME record pointing to autodiscover.outlook.com.
Why it's wrong here
CNAME records are for service discovery.
✓
Add an MX record pointing to contoso-com.mail.protection.outlook.com.
Why this is correct
MX records direct email to Exchange Online.
Related concept
Read the scenario before looking for a memorised answer.
✗
Add an SPF record for contoso.com.
Why it's wrong here
SPF records prevent spoofing, not enable routing.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse the domain verification step (TXT record) with the email routing step (MX record), and Microsoft explicitly tests this distinction by asking for the record that 'enables email routing' rather than 'verifies ownership'.
Detailed technical explanation
How to think about this question
Under the hood, Microsoft 365 uses a specific MX record format: for a custom domain like contoso.com, the MX record must point to 'contoso-com.mail.protection.outlook.com' (where the hyphen replaces the dot in the domain name). This record directs SMTP traffic to Microsoft's mail gateway, which then processes and delivers messages to the appropriate Exchange Online mailbox. A common real-world scenario is that administrators often forget to update the MX record after verifying ownership, causing inbound email to fail silently.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this MS-102 question in full detail.
Deploy and manage a Microsoft 365 tenant — This question tests Deploy and manage a Microsoft 365 tenant — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Add an MX record pointing to contoso-com.mail.protection.outlook.com. — Option C is correct because when you add a custom domain to Microsoft 365 and need to enable email routing, you must prove domain ownership and configure mail flow. The MX record with the value 'contoso-com.mail.protection.outlook.com' is the specific record that Microsoft 365 requires to route incoming email for your domain to Exchange Online. This record is added after domain ownership is verified (usually via a TXT record), but the question asks which record type enables email routing, which is the MX record.
What should I do if I get this MS-102 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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