SPF, DKIM, and DMARC Explained for Email Senders

If your email lands in spam, missing or misconfigured authentication is usually why. Three DNS records prove your mail is genuine:

SPF (Sender Policy Framework)

A DNS TXT record listing which servers may send mail for your domain — it stops spammers from forging your envelope sender.

DKIM (DomainKeys Identified Mail)

A cryptographic signature on every message, with the public key in DNS. It proves the message was not altered and came from your domain.

DMARC

Ties SPF and DKIM together with a policy (none/quarantine/reject) and tells providers what to do with mail that fails — plus reports. Start at p=none, then tighten.

The easy way

Relayly generates per-domain DKIM keys and the exact SPF/DKIM/DMARC records with one-click DNS verification, so authentication is correct from day one.