How to use Email Validator (npm)
- Give Email Validator (npm) an email address or domain to work with.
- Trigger Email Validator (npm) and it sends the DNS lookups from your browser, not from this site.
- See the response from a public DNS resolver; Email Validator (npm) only displays what comes back.
About this tool
Email Validator (npm) runs as a page in your browser. Email Validator (npm) 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
What does Email Validator (npm) do?
Email Validator (npm) validates the address format and checks the domain's MX, SPF and DMARC records via DNS from your browser.
Is Email Validator (npm) free to use?
Yes — Email Validator (npm) is completely free, with no usage limits.
Where does Email Validator (npm) run its checks?
Email Validator (npm) 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 (npm) confirm a mailbox really exists?
Email Validator (npm) 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.