How to use Email Validator Online
- Give Email Validator Online an email address or domain to work with.
- Trigger Email Validator Online and it sends the DNS lookups from your browser, not from this site.
- See the response from a public DNS resolver; Email Validator Online only displays what comes back.
About this tool
Email Validator Online is a static, browser-based client. Email Validator Online validates an address syntax locally, then checks the domain MX, SPF and DMARC records over DNS-over-HTTPS.
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 Online?
Email Validator Online validates the address format and checks the domain's MX, SPF and DMARC records via DNS from your browser.
Is Email Validator Online free to use?
Yes — Email Validator Online is completely free, with no usage limits.
Where does Email Validator Online run its checks?
Email Validator Online 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 Online confirm a mailbox really exists?
Email Validator Online 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.