Email DNS Checker: MX, SPF, DKIM & DMARC
Enter a domain and optionally a DKIM selector for a server-side lookup. Record presence and the summary score do not prove mail authenticity or delivery.
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Enter a domain and optionally a DKIM selector for a server-side lookup. Record presence and the summary score do not prove mail authenticity or delivery.
Email DNS Security Checker belongs to the network tools on KivTools. The workbench above handles the whole job on one screen: a mix of typed values and options, then a text result you can copy.
The workbench sends your request to the KivTools endpoint in Los Angeles and returns the answer to the page. Nothing is written to a database, but the input does travel over the network, so live secrets and personal data do not belong in it.
Web infrastructure problems are usually visible only from the outside: what DNS answers, which headers a server returns, whether a redirect loops or a certificate covers the hostname. These tools inspect a live endpoint from the public internet and report what an ordinary client would see.
A single probe is a snapshot, not a guarantee. GeoDNS, CDNs and caches can answer differently from another network, so compare results from a second vantage point before changing production settings.
Browsers, desktop tools and command-line utilities should agree on the result; a mismatch usually means a different encoding, locale or version. Reproduce the finding with the platform’s own tools (dig, curl -I, openssl s_client) before you act on it; the numbers should agree.
Timeouts and blocked ports often come from firewalls or ISPs on the path, not from the target service itself, which is why an external check is a useful second opinion. Keep a copy of the input while you experiment, so a wrong setting never destroys the source.
Accepts a domain and optional DKIM selector; returns the published DNS records for the checked protocols plus a transparent configuration score.
Verify a domain's email authentication before deployment; audit DNS changes after updating SPF or DKIM; diagnose missing MTA-STS or BIMI records.
The submitted domain is sent to KivTools for server-side MX, SPF, DKIM-related, and DMARC DNS checks.
DKIM results require the exact selector; results reflect only published DNS records, not actual email delivery or authentication outcomes.
Yes. Every tool on KivTools is free, needs no account and has no usage quota. There is no paid tier hiding behind the workbench, and no email address is required to use the result.
On the KivTools server. The input is sent over HTTPS, processed for the response and discarded; only anonymous request counters are kept.
Accepts a domain and optional DKIM selector; returns the published DNS records for the checked protocols plus a transparent configuration score. Large inputs are usually handled without trouble, but extremely large ones are better processed in a local command-line tool.
Caches and CDNs lie happily: check the authoritative source and a second resolver. Compare a small known-good sample first when the output feeds an automated pipeline.
The output is yours: no watermark, no licence tag, no attribution requirement. Check the underlying format or library licence when the result ships in a product.