Free IT & Cyber Security Tool

DNS / DMARC Checker

Check MX, SPF, DKIM, DMARC, BIMI, MTA-STS, TLS-RPT, TXT, A, AAAA, NS, CAA and DNSSEC records with plain-English explanations.

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DNS / DMARC Lookup

DKIM records use a selector, for example selector._domainkey.example.com. DNS changes can take time to appear because of TTL/caching.

Security Summary

Enter a domain to start.

FAQs

Why are SPF, DKIM and DMARC important?

They help receiving mail systems verify whether email using your domain is legitimate.

Why is my DKIM record missing?

The selector may be different, DKIM may not be enabled, or DNS changes may not have propagated yet.

Should DMARC be set to reject?

Reject is stronger, but move carefully. Start by reviewing legitimate sending sources and reports before enforcing.

Can MDS help configure DNS records?

Yes. MDS can configure SPF, DKIM, DMARC, MX and Microsoft 365 or Google Workspace DNS records.

Need help with your IT or cyber security?

Contact MDS for practical support with Microsoft 365, DNS, email security, SSL, domains, networks and business technology.

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