ITPEC FE Subject A April 2025 Question 33
ITPEC FE Subject A April 2025 — Question 33 of 60
SPF (Sender Policy Framework) — email authentication that verifies the sender's mail server IP against the domain's DNS record.
SPF works by publishing a DNS TXT record that lists all IP addresses authorized to send email for a domain. When a receiving mail server gets an email, it checks whether the sender's IP matches the SPF record of the domain in the "From" address. If it doesn't match, the email can be rejected or flagged as spam.
Why not others:
- (a) Describes an internal company policy about who sends emails — has nothing to do with the SPF protocol
- (b) Describes email spoofing (the problem SPF is designed to prevent), not SPF itself
- (d) Describes sending email to a single recipient — this is unrelated to SPF authentication
Key rule: SPF = DNS record that lists authorized sender IPs → receiving server checks IP against that list → accept or reject.
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