There are several key email authentication protocols that marketers should be aware of:
SPF (Sender Policy Framework): This protocol allows domain owners to specify which mail servers are permitted to send emails on behalf of their domain. It helps to prevent unauthorized users from sending emails that appear to come from your domain. DKIM (DomainKeys Identified Mail): DKIM adds a digital signature to your emails, which recipients can use to verify that the email was not altered in transit and that it indeed comes from your domain. DMARC (Domain-based Message Authentication, Reporting & Conformance): DMARC builds on SPF and DKIM by providing a way for domain owners to publish policies on how to handle emails that fail authentication checks. It also provides reporting features for monitoring email traffic.