Email Authentication Checker
SPF, DMARC, DKIM selectors, and MX records for outbound and inbound mail policy.
About this tool
Look up DNS records that control how mail servers validate messages claiming to be from your domain — SPF (authorized senders), DMARC (policy when checks fail), DKIM (signatures), and MX (inbound mail hosts).
What you get
- SPF TXT record with common misconfiguration hints
- DMARC record at _dmarc with policy summary
- DKIM records for widely used selectors (Google, Microsoft, SendGrid, etc.)
- MX hosts sorted by priority
How to use
Enter the domain that sends or receives mail for your organization. DKIM may use a custom selector not in our default list — check your provider docs if none are found.
FAQ
How to check SPF record for a domain?
Enter the domain to fetch and parse the SPF TXT record, see authorized senders, and read whether the policy passes or fails validation.
How to verify DMARC policy?
The check reads the _dmarc TXT record and reports policy mode (none, quarantine, reject), alignment hints, and configuration issues.
How to test DKIM configuration?
Common selector names are tried automatically; published public keys and signature readiness are summarized with any problems found.
Why is email authentication important?
SPF, DKIM, and DMARC help receivers trust your mail, reduce spoofing, and improve deliverability to the inbox instead of spam folders.
By using this tool you agree to our Terms of Use and Privacy Policy. Results are provided as-is without warranty.