SPF, DKIM, and DMARC help authenticate email senders by verifying that the emails came from the domain that they claim to be from. These three authentication methods are important for preventing spam, phishing attacks, and other email security risks.
We can,
determine the sender is authorized to send email from the source domain using SPF (Sender Policy Framework)
authenticate a message by verifying the message's digital signature, using DKIM (DomainKeys Identified Mail)
determine the desired action for unauthenticated messages using DMARC (Domain-based Message Authentication Reporting & Conformance)