Why email authentication matters
Attackers frequently abuse trusted-looking sender identities in phishing and business email impersonation. Domain-level email authentication helps receiving systems evaluate whether messages claiming to come from your domain are legitimate.
SPF: who is allowed to send
Sender Policy Framework (SPF) lets a domain publish which mail systems are authorized to send email on its behalf. A correct record helps receivers identify unauthorized sending sources.
DKIM: was the message signed
DomainKeys Identified Mail (DKIM) adds a cryptographic signature to email. Receiving systems can use the public key published in DNS to validate that a message was signed by an authorized domain and was not altered in transit.
DMARC: policy and alignment
DMARC builds on SPF and DKIM. It defines how receivers should handle messages that fail authentication and alignment checks, and it can provide reporting that helps domain owners understand who is sending mail using their domain.
Configuration matters
Having SPF, DKIM and DMARC records is not the same as having an effective email security posture. Records should reflect legitimate mail flows, avoid configuration errors and use an appropriate DMARC policy based on testing and operational readiness.