Question 1010
At Brightstone Legal, a team reports that it corrected the following problem affecting client matters and confidential documents: An executive-impersonation rule blocks legitimate internal bulk notices because sender policy matching is too broad. Which observation BEST verifies that the correction actually worked?
Explanation
Correct Answer
Legitimate notices deliver and impersonation tests still trigger review. This is the decisive evidence for the original problem: An executive-impersonation rule blocks legitimate internal bulk notices because sender policy matching is too broad. It verifies that the intended corrective control—Tune identity, sender domain, and authentication conditions with controlled exceptions—works in the relevant environment; a completed change ticket alone would not prove the outcome at Brightstone Legal.
Incorrect Answers
A controlled malicious message to the new domain generates the configured detection. This would be relevant evidence for a different failure: A newly onboarded mail domain receives insufficient threat inspection because it was never included in protected scope, usually addressed by Validate domain or tenant integration and assign the appropriate email threat policies. It does not demonstrate that the current problem at Brightstone Legal was resolved. The specific required evidence is: Legitimate notices deliver and impersonation tests still trigger review.
The security case lists affected accounts, related messages, and remediation status. This would be relevant evidence for a different failure: The email security console produces detections but SOC analysts cannot correlate the affected recipients, usually addressed by Integrate email threat event metadata with incident workflow and recipient targeting information. It does not demonstrate that the current problem at Brightstone Legal was resolved. The specific required evidence is: Legitimate notices deliver and impersonation tests still trigger review.
A simulated post-delivery threat is identified and remediated from affected mailboxes. This would be relevant evidence for a different failure: Security email tooling detects suspicious messages but admins have no process to remove copies already delivered, usually addressed by Configure approved mailbox remediation or quarantine workflows and incident ownership. It does not demonstrate that the current problem at Brightstone Legal was resolved. The specific required evidence is: Legitimate notices deliver and impersonation tests still trigger review.