Verify Your Sending Domain: SPF, DKIM and DMARC

Authentication is the foundation of deliverability. eSMS Mail signs every message from a verified domain with DKIM and checks SPF and DMARC alignment.

Add your domain

Under Domains → Add domain, we generate five DNS records: a verification TXT, a DKIM key (esms._domainkey), an SPF include, a DMARC policy, and a return-path CNAME.

Publish and verify

• SPF — authorises our servers to send for your domain.
• DKIM — a 2048-bit signature proving the message wasn't altered. eSMS Mail signs automatically once the domain is verified.
• DMARC — tells receivers what to do if SPF/DKIM fail, and gives you reports.

Click Verify after your DNS propagates (usually minutes, up to 24h). Once verified, DKIM signing is applied to all your outbound mail.

Why it matters

Unauthenticated mail lands in spam or is rejected outright. A verified, DKIM-signed domain with a DMARC policy is the single biggest deliverability win.