How to use Email Verifier Online
- Start by entering an email address or domain in Email Verifier Online.
- Trigger Email Verifier Online and it sends the DNS lookups from your browser, not from this site.
- See the response from a public DNS resolver; Email Verifier Online only displays what comes back.
About this tool
There is no server of ours behind Email Verifier Online. Email Verifier Online validates an address syntax locally, then checks the domain MX, SPF and DMARC records over DNS-over-HTTPS.
Proving a specific mailbox exists requires sending mail, which a browser cannot do, so Email Verifier Online focuses on the DNS signals that genuinely can be checked. 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
What does Email Verifier Online do?
Email Verifier Online validates the address format and checks the domain's MX, SPF and DMARC records via DNS from your browser.
Does Email Verifier Online cost anything?
No — Email Verifier Online is completely free, with no sign-up and no hidden limits.
Where does Email Verifier Online run its checks?
Email Verifier 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 Verifier Online confirm a mailbox really exists?
Email Verifier 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.