This NSE7 practice question tests your understanding of advanced threat protection. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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.
An organization uses FortiMail and wants to validate that incoming emails are from legitimate senders by checking the sender's domain against a published policy. Which two email authentication mechanisms can FortiMail use? (Choose two.)
DKIM and DMARC
Why wrong: DMARC is not authentication.
STARTTLS and SPF
Why wrong: STARTTLS is encryption, not authentication.
DMARC and SPF
Why wrong: DMARC is a policy, not an authentication mechanism.
SPF and DKIM
SPF verifies the sending IP, DKIM verifies the signature.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
SPF and DKIM
FortiMail can use SPF (Sender Policy Framework) and DKIM (DomainKeys Identified Mail) to validate that incoming emails originate from legitimate senders by checking the sender's domain against a published policy. SPF verifies that the sending IP address is authorized by the domain's DNS TXT record, while DKIM uses a digital signature in the email header that can be validated against a public key published in the sender's DNS. Both mechanisms allow FortiMail to authenticate the sender's domain before accepting the message.
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.
DKIM and DMARC
Why it's wrong here
DMARC is not authentication.
STARTTLS and SPF
Why it's wrong here
STARTTLS is encryption, not authentication.
DMARC and SPF
Why it's wrong here
DMARC is a policy, not an authentication mechanism.
SPF and DKIM
Why this is correct
SPF verifies the sending IP, DKIM verifies the signature.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
The trap here is that candidates often confuse DMARC as an authentication mechanism when it is actually a policy framework that relies on SPF and DKIM results, leading them to select options that include DMARC instead of the two core authentication protocols.
Detailed technical explanation
SPF (RFC 7208) uses a DNS TXT record listing authorized sending IPs, and FortiMail checks the envelope sender (MAIL FROM) domain against this record. DKIM (RFC 6376) adds a digital signature to the email header, which FortiMail validates by retrieving the selector-based public key from the sender's DNS; a match proves the email was not tampered with and originated from a domain-authorized server. In practice, FortiMail can apply these checks at the gateway level, and administrators can configure actions like quarantine or reject based on SPF/DKIM results before DMARC policy evaluation.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
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FAQ
Advanced Threat Protection — This question tests Advanced Threat Protection — Read the scenario before looking for a memorised answer..
The correct answer is: SPF and DKIM — FortiMail can use SPF (Sender Policy Framework) and DKIM (DomainKeys Identified Mail) to validate that incoming emails originate from legitimate senders by checking the sender's domain against a published policy. SPF verifies that the sending IP address is authorized by the domain's DNS TXT record, while DKIM uses a digital signature in the email header that can be validated against a public key published in the sender's DNS. Both mechanisms allow FortiMail to authenticate the sender's domain before accepting the message.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
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.
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