DMARC (Domain-based Message Authentication, Reporting, and Conformance): DMARC is an email authentication protocol that uses SPF and DKIM to verify sender identity and provides instructions to receiving servers on how to handle unauthenticated emails.

SPF (Sender Policy Framework): SPF is an email validation system designed to prevent email spoofing by specifying which mail servers are authorized to send email on behalf of your domain.

DKIM (DomainKeys Identified Mail): DKIM is an email security standard that allows senders to sign their emails digitally to prove the content hasn't been altered in transit, thereby verifying the sender's authenticity.

BIMI (Brand Indicators for Message Identification): BIMI is an email standard that enables the display of brand-controlled logos next to authenticated emails, enhancing brand visibility and recipient trust.