How to use Email Validator
- Start by entering an email address or domain in Email Validator.
- Run it, and Email Validator issues the DNS lookups directly from your browser.
- See the response from a public DNS resolver; Email Validator only displays what comes back.
About this tool
Email Validator runs in your browser with no backend of its own. Email Validator inspects the DNS-level deliverability signals for a domain directly from your browser.
The MX, SPF and DMARC lookups are real DNS-over-HTTPS queries, not guesses. The MX, SPF and DMARC checks are DNS queries sent from your browser to a public resolver; this site has no backend and never sees them, and a connection is required.
Frequently asked questions
How do I use Email Validator?
Email Validator validates the address format and checks the domain's MX, SPF and DMARC records via DNS from your browser.
Does Email Validator cost anything?
No — Email Validator is completely free, with no sign-up and no hidden limits.
Where does Email Validator run its checks?
Email Validator runs DNS lookups (MX, SPF, DMARC) from your browser against a public DNS-over-HTTPS resolver. This site has no backend and never sees them; the public resolver does.
Can Email Validator confirm a mailbox really exists?
Email Validator checks address syntax and the domain's MX, SPF and DMARC via DNS-over-HTTPS; proving a live mailbox needs to send mail, which a browser cannot do.