Glossary: Security+ Exam Prep 3: Practice Exams
DKIM (DomainKeys Identified Mail)
Also written: DKIM, DKIM selector
An email authentication method that signs outgoing mail so receivers can check that it came from the domain. Adding another selector does not make receivers refuse fake mail.
Where the book teaches it
Related terms
DMARC (Domain-based Message Authentication, Reporting, and Conformance)