Free Tool

Email Authentication Checker

Enter any domain to check its SPF, DKIM, and DMARC records. See exactly what's configured, what's missing, and what to fix.

We use Google's public DNS API. No data is stored.

Checking DNS records...

Need help fixing these records?

Read Our Setup Guide

Why Email Authentication Matters

Gmail, Yahoo, and Outlook require SPF, DKIM, and DMARC for bulk senders. Without them, your cold emails go straight to spam.

🔐

SPF

Tells receiving servers which IPs are allowed to send email from your domain. Like a guest list for your mail servers.

✍️

DKIM

Adds a digital signature to every email, proving it hasn't been tampered with during delivery.

🛡️

DMARC

Ties SPF and DKIM together and tells receivers what to do when authentication fails.

Authentication Is Just Step One

AutoMailer handles warmup, inbox placement testing, and blacklist monitoring so your cold emails actually reach the inbox.

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