- A
Microsoft 365 Defender portal
Why wrong: Incorrect: The Defender portal manages security policies but not mail flow rules.
- B
Microsoft Defender for Cloud Apps portal
Why wrong: Incorrect: Defender for Cloud Apps is for SaaS app security, not mail flow.
- C
Exchange admin center
Correct: EAC allows creation of mail flow rules (transport rules) to block based on subject keywords.
- D
Microsoft Entra admin center
Why wrong: Incorrect: Entra ID is for identity and access management, not mail flow.
Question 461 of 1,411
Creating Custom Mail Flow Rules in Exchange Admin Center
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 uses Microsoft Defender for Office 365. A user reports receiving a phishing email that bypassed the default filters. You need to create a custom mail flow rule to block similar emails based on specific keywords in the subject line. Which tool should you use?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Exchange admin center
To create a custom mail flow rule (also known as a transport rule) that blocks emails based on specific keywords in the subject line, you must use the Exchange admin center (EAC). Mail flow rules are processed by the Exchange Online transport pipeline and are configured within the EAC or via Exchange Online PowerShell, not through the Microsoft 365 Defender portal, which focuses on threat policies and incident response rather than transport-level rule creation.
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.
- ✗
Microsoft 365 Defender portal
Why it's wrong here
Incorrect: The Defender portal manages security policies but not mail flow rules.
- ✗
Microsoft Defender for Cloud Apps portal
Why it's wrong here
Incorrect: Defender for Cloud Apps is for SaaS app security, not mail flow.
- ✓
Exchange admin center
Why this is correct
Correct: EAC allows creation of mail flow rules (transport rules) to block based on subject keywords.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Microsoft Entra admin center
Why it's wrong here
Incorrect: Entra ID is for identity and access management, not mail flow.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse the Microsoft 365 Defender portal (which handles security policies) with the Exchange admin center (which handles mail flow rules), leading them to incorrectly select option A because they assume all email security configurations are centralized in the Defender portal.
Detailed technical explanation
How to think about this question
Mail flow rules in Exchange Online are evaluated by the transport agent on messages as they pass through the service, using conditions like 'subject contains any of these words' with a maximum of 10 keywords per rule. These rules can also apply advanced actions such as redirecting, rejecting, or quarantining messages, and they support pattern matching via regular expressions (regex) for more complex keyword detection. In a real-world scenario, an organization might use a mail flow rule to block emails with subject lines containing 'urgent payment' or 'account suspended' to catch phishing attempts that bypass default filters.
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.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
- →
Describe the capabilities of Microsoft security solutions — study guide chapter
Learn the concepts, then practise the questions
- →
Describe the capabilities of Microsoft security solutions practice questions
Targeted practice on this topic area only
- →
All SC-900 questions
1,411 questions across all exam domains
- →
Microsoft Security, Compliance, and Identity Fundamentals SC-900 study guide
Full concept coverage aligned to exam objectives
- →
SC-900 practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Related SC-900 practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Describe the capabilities of Microsoft Entra practice questions
Practise SC-900 questions linked to Describe the capabilities of Microsoft Entra.
Describe the capabilities of Microsoft security solutions practice questions
Practise SC-900 questions linked to Describe the capabilities of Microsoft security solutions.
Describe the capabilities of Microsoft compliance solutions practice questions
Practise SC-900 questions linked to Describe the capabilities of Microsoft compliance solutions.
Describe the concepts of security, compliance, and identity practice questions
Practise SC-900 questions linked to Describe the concepts of security, compliance, and identity.
SC-900 fundamentals practice questions
Practise SC-900 questions linked to SC-900 fundamentals.
SC-900 scenario practice questions
Practise SC-900 questions linked to SC-900 scenario.
SC-900 troubleshooting practice questions
Practise SC-900 questions linked to SC-900 troubleshooting.
Practice this exam
Start a free SC-900 practice session
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
FAQ
Questions learners often ask
What does this SC-900 question test?
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..
What is the correct answer to this question?
The correct answer is: Exchange admin center — To create a custom mail flow rule (also known as a transport rule) that blocks emails based on specific keywords in the subject line, you must use the Exchange admin center (EAC). Mail flow rules are processed by the Exchange Online transport pipeline and are configured within the EAC or via Exchange Online PowerShell, not through the Microsoft 365 Defender portal, which focuses on threat policies and incident response rather than transport-level rule creation.
What should I do if I get this SC-900 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.
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 →
Keep practising
More SC-900 practice questions
- An organization uses Microsoft Purview Compliance Manager to track compliance with regulations. The compliance officer n…
- A company uses Microsoft Teams and wants to ensure that messages containing offensive language are flagged for review. W…
- A financial services firm uses Microsoft Purview Information Barriers to prevent traders from communicating with investm…
- A company uses a cloud-based SaaS (Software as a Service) application for customer relationship management. According to…
- A company has a document management system. The security policy requires that a user in the Sales department can only vi…
- A company implements a security measure to ensure that only authorized employees can view sensitive customer records. Wh…
Last reviewed: Jul 4, 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.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.