CiscoCisco
200-201 · Question #347
200-201 Question #347: Real Exam Question with Answer & Explanation
The correct answer is A: denying any email from a sender it does not recognize. Email greylisting is an anti-spam technique where a Mail Transfer Agent (MTA) temporarily rejects email from a sender it has not previously encountered.
Submitted by omar99· Mar 6, 2026Security Concepts
Question
What is email greylisting by the mail transfer agent?
Options
- Adenying any email from a sender it does not recognize
- Breturning emails that are potential phishing attempts
- Callowing emails from unknown senders temporarily
- Dquarantining emails sent from outside of the organization
Explanation
Email greylisting is an anti-spam technique where a Mail Transfer Agent (MTA) temporarily rejects email from a sender it has not previously encountered.
Common mistakes.
- B. Returning emails that are potential phishing attempts is a function of content filtering or advanced threat protection, not greylisting.
- C. Greylisting temporarily denies emails from unknown senders, it does not allow them temporarily; it delays them to verify legitimacy.
- D. Quarantining emails from outside the organization is a general spam or policy enforcement action, not the specific mechanism of greylisting which relies on temporary rejection and retry.
Concept tested. Email greylisting mechanism
Topics
#email security#greylisting#MTA#spam prevention
Community Discussion
No community discussion yet for this question.