MX, SPF, DKIM, and DMARC records are responsible for various aspects of email authentication and security.
An MX (Mail Exchange) record points to the servers that are responsible for receiving and delivering email for a domain. This entry specifies where mail addressed to this domain should be sent.
An SPF (Sender Policy Framework) record defines a list of servers that have permission to send email on behalf of a given domain. SPF helps combat sender spoofing and improves mail deliverability.
The DKIM (DomainKeys Identified Mail) record is used for email authentication and digitally signs outgoing messages. The receiving server can check the signature to ensure that the message has not been modified and is sent on behalf of the correct domain.
A DMARC (Domain-based Message Authentication, Reporting and Conformance) record establishes an authentication policy for a domain and determines how the receiving server should handle messages that fail SPF and DKIM checks. DMARC also provides message delivery and authentication reports.
Together, these records help improve email security and deliverability, and protect your domain from spam and spoofing.