Email Authentication

Email authentication refers to technical protocols (SPF, DKIM, DMARC) that verify the identity of email senders and prevent spoofing and phishing attacks. SPF (Sender Policy Framework) specifies which servers can send emails for a domain. DKIM (DomainKeys Identified Mail) adds a digital signature to verify email integrity. DMARC (Domain-based Message Authentication, Reporting & Conformance) builds on SPF and DKIM to provide reporting and policy enforcement. Proper authentication improves deliverability by reducing spam folder placement and protecting brand reputation. Major inbox providers like Gmail and Yahoo now require DMARC enforcement for bulk senders. Authentication setup requires DNS record configuration and ongoing monitoring through aggregate and forensic reports.