The correct answer is to add the partner domain to the Allow list in the Tenant Allow/Block List. This action directly instructs Microsoft Defender for Office 365 to override the filtering verdict for that specific domain, ensuring legitimate emails from the partner domain are delivered instead of being quarantined, while still maintaining security for other senders. On the MS-102 exam, this scenario tests your understanding of the Tenant Allow/Block List as a targeted override tool, with a common trap being the temptation to create a transport rule that bypasses all security checks or to disable anti-spam policies entirely, both of which are poor practices. Remember that the Allow list is a temporary fix; the long-term best practice is to fix the partner’s email authentication (SPF, DKIM, DMARC) to prevent future quarantining. Memory tip: Think “Allow list for the partner, not a blanket bypass”—it’s a scalpel, not a sledgehammer.
MS-102 Practice Question: Manage security and threats by using Microsoft Defender XDR
This MS-102 practice question tests your understanding of manage security and threats by using microsoft defender xdr. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 organization has Microsoft Defender for Office 365. Users report that legitimate emails from a partner domain are being quarantined. You need to ensure these emails are delivered while maintaining security. What should you do?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Add the partner domain to the Allow list in the Tenant Allow/Block List.
Option B is correct because adding the partner domain to the Allow list in the Tenant Allow/Block List allows the emails but may be used temporarily; long-term best practice is to fix authentication. Option A is wrong because disabling filtering is not recommended. Option C is wrong because it affects all external emails. Option D is wrong because creating a transport rule bypasses security checks and is not best practice.
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 the partner domain to the Allow list in the Tenant Allow/Block List.
Why this is correct
This allows the domain while maintaining filtering for other domains; however, the root cause should be addressed.
Related concept
Read the scenario before looking for a memorised answer.
✗
Disable spam filtering for the partner domain.
Why it's wrong here
Disabling filtering reduces security for all emails from that domain.
✗
Lower the spam confidence level (SCL) threshold for the organization.
Why it's wrong here
Lowering SCL affects all incoming emails and may increase spam.
✗
Create a mail flow rule to bypass spam filtering for the partner domain.
Why it's wrong here
Mail flow rules bypassing filtering can be used but are less transparent and may be exploited.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this MS-102 question in full detail.
Identify which MS-102 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Manage security and threats by using Microsoft Defender XDR — This question tests Manage security and threats by using Microsoft Defender XDR — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Add the partner domain to the Allow list in the Tenant Allow/Block List. — Option B is correct because adding the partner domain to the Allow list in the Tenant Allow/Block List allows the emails but may be used temporarily; long-term best practice is to fix authentication. Option A is wrong because disabling filtering is not recommended. Option C is wrong because it affects all external emails. Option D is wrong because creating a transport rule bypasses security checks and is not best practice.
What should I do if I get this MS-102 question wrong?
Identify which MS-102 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. Your organization uses Microsoft Defender for Office 365. Users report that legitimate emails from a specific partner domain are being moved to Junk Email folder. You verify that the partner's SPF, DKIM, and DMARC records are correctly configured. Which two actions should you take to resolve this issue?
medium
A.Modify the Anti-Spam policy to increase the spam threshold.
✓ B.Review the Anti-Phishing policy's spoof intelligence settings.
C.Configure the Outbound spam filter policy.
D.Disable the Spam filter for the affected users.
✓ E.Add the partner domain to the Tenant Allow/Block List as an allowed domain.
Why B: Option A is correct because you can create an Allow entry in the Tenant Allow/Block List to explicitly allow emails from the partner domain. Option D is correct because reviewing the phishing simulation and spoof intelligence settings can help identify if the system is misclassifying the domain. Option B is wrong because the Anti-Spam policy is not the cause; the issue is likely in the anti-phishing or spoof settings. Option C is wrong because disabling spam filtering is too aggressive and not recommended. Option E is wrong because the issue is with inbound filtering, not outbound.
Last reviewed: Jun 21, 2026
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This MS-102 practice question is part of Courseiva's free Microsoft certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the MS-102 exam.
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