What type of DNS record is used by the Sender Policy Framework (SPF)?

What type of DNS record is used by the Sender Policy Framework (SPF)?

• TXT
• MX
• A
• CNAME 

 

EXPLANATION

Sender Policy Framework (SPF) is a simple email-validation system designed to detect email spoofing. The SPF is an open standard specifying a technical method to prevent sender-address forgery. SPF allows administrators to specify which hosts are allowed to send mail on behalf of a given domain by creating a specific SPF record (or TXT record) in the Domain Name System (DNS). Mail exchangers use DNS records to check that mail from a given domain is being sent by a host sanctioned by that domain's administrators.