NSE7 Advanced Threat Protection Practice Question
An admin receives an email from FortiMail regarding a message that was rejected due to SPF failure. What does this indicate about the email?
⚠ Common exam trap
Watch out — candidates often confuse SPF with DKIM or assume SPF validates the 'From' header domain, when in fact SPF validates the envelope sender domain (Return-Path) against the connecting IP, and a failure does not imply the message is malicious—only that it failed an authorization check.
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
✓
The email's From address domain does not match the sending server's IP per the domain's SPF record
SPF (Sender Policy Framework) validation checks whether the sending mail server's IP address is authorized to send mail for the domain in the envelope 'From' (RFC 5321.MailFrom) or the header 'From' address. When FortiMail rejects a message due to SPF failure, it means the IP of the connecting server does not match any of the authorized IPs listed in the domain's SPF TXT record (as defined in RFC 7208). This is a direct authentication failure, not a content-based or signature-based issue.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
The email's From address domain does not match the sending server's IP per the domain's SPF record
Why this is correct
SPF checks the envelope sender domain against the sending IP.
- ✗
The email's DKIM signature is invalid
Why it's wrong here
SPF is separate from DKIM.
- ✗
The email contains a virus
Why it's wrong here
SPF is an authentication mechanism, not a content scanner.
- ✗
The email is missing a Message-ID header
Why it's wrong here
Message-ID is not related to SPF.
Go deeper
Related to this question
About these practice questions
Courseiva writes every NSE7 question from scratch — 940 in total, each with an explanation and a wrong-answer breakdown. None are copied from real exams or dumps. Learn why practice questions differ from exam dumps →
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.