Google performs checks on messages sent to Gmail accounts to verify messages are authenticated. To help ensure these messages are delivered as expected, we will set up email authentication for your domain. The setup of SPF, DKIM and DMARC protects your email, and provides the authentication required for safe email delivery. Without DKIM, your domain emails are more likely to be marked as spam by receiving mail servers.
DMARC (Domain-based Message Authentication, Reporting, and Conformance) is an email authentication protocol that helps protect email senders and recipients from threats like spoofing and data breaches. DMARC builds on DKIM (DomainKeys Identified Mail), and SPF (Sender Policy Framework) to verify email senders and improve email delivery.