Quick Answer
The answer is a mail flow rule, also known as a transport rule, which is the correct feature to configure for automatically adding a disclaimer to the top of external emails in Exchange Online. This works because mail flow rules are designed to inspect messages as they pass through the transport pipeline, allowing administrators to apply actions like prepending text, appending a signature, or modifying the subject line based on conditions such as the sender’s domain or recipient location. On the Microsoft Security, Compliance, and Identity Fundamentals SC-900 exam, this question tests your understanding of core Exchange Online compliance features, often appearing alongside common distractors like Data Loss Prevention policies, which block sensitive data but cannot insert disclaimers, or Safe Links, which only rewrites URLs for protection. A frequent trap is confusing DLP’s notification capabilities with the actual insertion of body text. To remember this, think of the mnemonic “TR for Text Rules”—Transport Rules are your go-to for adding text-based disclaimers.
This SC-900 practice question tests your understanding of describe the capabilities of microsoft security solutions. 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 organization wants to ensure that all external emails are automatically tagged with a disclaimer at the top of the email body. Which Microsoft Exchange Online feature should you configure?
Journal rule
Why wrong: Journal rules record messages for compliance, not add disclaimers.
Data loss prevention (DLP) policy
Why wrong: DLP policies prevent sharing sensitive data, not add disclaimers.
Safe Links policy
Why wrong: Safe Links protects links, not adds disclaimers.
Mail flow rule (transport rule)
Mail flow rules can apply disclaimers to messages based on conditions.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Mail flow rule (transport rule)
Option C is correct because mail flow rules (transport rules) can add disclaimers to emails. Option A is incorrect because DLP policies do not add disclaimers. Option B is incorrect because Safe Links adds URL protection, not disclaimers. Option D is incorrect because journaling archives emails.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Journal rule
Why it's wrong here
Journal rules record messages for compliance, not add disclaimers.
Data loss prevention (DLP) policy
Why it's wrong here
DLP policies prevent sharing sensitive data, not add disclaimers.
Safe Links policy
Why it's wrong here
Safe Links protects links, not adds disclaimers.
Mail flow rule (transport rule)
Why this is correct
Mail flow rules can apply disclaimers to messages based on conditions.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
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
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.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
Identify which SC-900 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.
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FAQ
Describe the capabilities of Microsoft security solutions — This question tests Describe the capabilities of Microsoft security solutions — Read the scenario before looking for a memorised answer..
The correct answer is: Mail flow rule (transport rule) — Option C is correct because mail flow rules (transport rules) can add disclaimers to emails. Option A is incorrect because DLP policies do not add disclaimers. Option B is incorrect because Safe Links adds URL protection, not disclaimers. Option D is incorrect because journaling archives emails.
Identify which SC-900 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.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 21, 2026
This SC-900 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 SC-900 exam.
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