How to use Valid Email Checker
- Give Valid Email Checker an email address or domain to work with.
- Press the button and Valid Email Checker sends the DNS lookups from your browser.
- Read the response Valid Email Checker shows below — it comes from a public DNS resolver, not from this site.
About this tool
Valid Email Checker is a static, browser-based client. Valid Email Checker 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 is Valid Email Checker for?
Valid Email Checker validates the address format and checks the domain's MX, SPF and DMARC records via DNS from your browser.
Do I need an account for Valid Email Checker?
No — Valid Email Checker needs no account, sign-up or installation.
Where does Valid Email Checker run its checks?
Valid Email 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 Checker confirm a mailbox really exists?
Valid Email 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.