How to use Valid Email Address Checker
- Give Valid Email Address Checker an email address or domain to work with.
- Run it, and Valid Email Address Checker issues the DNS lookups directly from your browser.
- Review the result, which Valid Email Address Checker fetches live from a public DNS resolver.
About this tool
There is no server of ours behind Valid Email Address Checker. Valid Email Address Checker 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
What is Valid Email Address Checker for?
Valid Email Address Checker validates the address format and checks the domain's MX, SPF and DMARC records via DNS from your browser.
Does Valid Email Address Checker cost anything?
No — Valid Email Address Checker is completely free, with no sign-up and no hidden limits.
Where does Valid Email Address Checker run its checks?
Valid Email Address Checker 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 Valid Email Address Checker confirm a mailbox really exists?
Valid Email Address Checker 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.