Free email DNS tools
Check whether a domain is set up to send and receive email. Each tool reads the domain’s public DNS records, explains what it finds in plain English, and gives you a corrected record to paste when something’s wrong. No sign-up needed.
Start here Support email checker Checks MX, SPF, DKIM and DMARC together and tells you in one verdict whether the domain is ready for support@.- DMARC Checker Reads the _dmarc record, explains each tag and flags weak policies, missing reports and tags removed in RFC 9989.
- SPF Checker Validates the SPF record and counts DNS lookups through every include and redirect against the limit of 10.
- DKIM Checker Finds DKIM keys by selector, checks they parse, and reports key type and length.
- MX Checker Lists MX records by priority, names the provider and checks each mail server resolves.
Which tool do I need?
- Setting up a new support address? Run the support email checker. It covers everything at once.
- Replies landing in spam? Start with the DMARC and SPF checkers, then confirm your DKIM key with your selector.
- Mail to your domain bouncing? The MX checker shows where mail is supposed to go and whether those servers resolve.
- Own a domain you don’t use for email? Any of the tools will suggest the three records that stop people sending spoofed mail from it.
Privacy: the tools read public DNS records only, through Cloudflare’s and Google’s public DNS resolvers. They don’t save the domains you check. DNS answers are cached for up to 5 minutes, and checks are counted per IP address (stored as a one-way hash) to prevent abuse. Like every page on this site, the address you load, including the domain in a results link, appears in our web server logs for about two weeks.
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