Glossary: Endpoint, Application and Email Security

SPF (Sender Policy Framework)

Also written: v=spf1

A TXT record that lists the servers allowed to send email for a domain. Receivers check it against the envelope sender, and it breaks when email is forwarded.

Where the book teaches it

Chapter 4: Email and Operating System Security

Related terms

SPF record endings (-all, ~all, ?all, +all)include:permerror envelope sender DMARC (Domain-based Message Authentication, Reporting, and Conformance)