Pick a tool
- Email ValidatorChecks syntax, whether the domain has mail servers, and flags disposable or role-based addresses.
- MX LookupLook up the mail servers configured to receive email for any domain.
- Header AnalyzerPaste raw headers to see the delivery path and authentication results — runs entirely in your browser.
- SPF CheckerLooks up a domain's SPF record and lists its mechanisms (senders it authorizes).
- DKIM CheckerLooks up a DKIM public-key record for a domain and selector.
- DMARC CheckerLooks up a domain's DMARC policy and reporting settings.
- Blacklist CheckerChecks an IPv4 address against a curated set of well-known email blacklists.
Frequently asked questions
Are these email tools free to use?
Yes. All seven tools — the Email Validator, MX Lookup, SPF/DKIM/DMARC checkers, Blacklist Checker, and Header Analyzer — are completely free, with no signup or account required.
Do you store the emails, domains, or headers I check?
No. Each check is a live, one-time lookup — we don't save what you type in. The Header Analyzer goes a step further and runs entirely in your browser, so pasted headers are never sent to our server at all.