Glossary: Attacks and Indicators
Authentication-Results
Also written: Authentication-Results header, ARC-Authentication-Results
An email header where the receiving mail server writes its SPF, DKIM and DMARC verdict. The phish sent to Jo showed `spf=fail` and `dmarc=fail` here.
Where the book teaches it
Related terms
SPF (Sender Policy Framework)DKIM (DomainKeys Identified Mail)DMARC (Domain-based Message Authentication, Reporting and Conformance)