The Complete Guide to DKIM, SPF, and DMARC

Why Email Authentication Matters

Email authentication prevents spoofing and phishing. It proves to receiving servers that you are who you say you are. Without it, your emails land in spam.

DKIM (DomainKeys Identified Mail)

DKIM adds a digital signature to every email. The receiving server checks this signature against a public key in your DNS. If it matches, the email is authentic.

SPF (Sender Policy Framework)

SPF tells receiving servers which IP addresses are allowed to send email for your domain. Add a TXT record to your DNS listing your authorized senders.

DMARC (Domain-based Message Authentication)

DMARC ties DKIM and SPF together. It tells receiving servers what to do with emails that fail authentication: none (monitor), quarantine (spam folder), or reject (block).

Setup with SendMesh

SendMesh handles this automatically. Add your domain, copy the DNS records, and verification completes in minutes.