Glossary: Security Monitoring and Automation
SPF (Sender Policy Framework)
Also written: SPF, spf=fail
An email check of whether the server that sent a message is allowed to send for the domain it claims. It failed on Jo's invoice.
Where the book teaches it
Related terms
DKIM (DomainKeys Identified Mail)DMARC (Domain-based Message Authentication, Reporting and Conformance)Authentication-Results