NSE7 Advanced Threat Protection Practice Question
An email security administrator wants to prevent attackers from spoofing the company's domain. Which email authentication mechanism should be configured to allow receiving servers to verify that emails claiming to be from the domain are sent from authorized mail servers?
⚠ Common exam trap
In Fortinet NSE7 exams, a common trap is confusing DMARC's policy enforcement with the actual verification of sending server authorization, leading candidates to select DMARC instead of SPF. Remember that SPF is the mechanism that explicitly lists authorized mail servers via DNS TXT records.
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
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SPF
SPF (Sender Policy Framework) is the correct answer because it allows domain owners to publish DNS records specifying which mail servers are authorized to send email on behalf of their domain. Receiving servers can then verify the envelope sender (Return-Path) against the SPF record to detect spoofed messages. This directly addresses the requirement to verify that emails claiming to be from the domain originate from authorized servers.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
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DMARC
Why it's wrong here
DMARC sets a policy for handling messages failing SPF or DKIM alignment and reports results, but it does not itself let a receiving server verify the sending host is authorised. It is tempting because DMARC is the domain-spoofing policy layer, yet the verification of authorised senders is performed by SPF.
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SPF
Why this is correct
SPF publishes a DNS TXT record listing the IP addresses and hosts authorised to send mail for the domain. Receiving servers query that record and reject or flag messages originating from unauthorised servers, directly blocking domain spoofing.
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TLS for SMTP
Why it's wrong here
TLS for SMTP encrypts the transport channel between mail servers; it does not let a receiving server verify that the sending host was authorised to send for the domain. It is tempting because TLS secures mail in transit, which is its actual purpose, but spoofing prevention requires sender authorisation, not channel confidentiality.
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DKIM
Why it's wrong here
DKIM cryptographically signs messages so the receiver can verify integrity and that the signing domain authorised the signature, but it does not validate the sending server's IP against an authorised list. It is tempting because DKIM is an email authentication mechanism, yet sender-host authorisation is SPF's function.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This NSE7 practice question is part of Courseiva's free Fortinet 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 NSE7 exam.