How to use Check if Email is Valid
- Give Check if Email is Valid an email address or domain to work with.
- Run it, and Check if Email is Valid issues the DNS lookups directly from your browser.
- See the response from a public DNS resolver; Check if Email is Valid only displays what comes back.
About this tool
There is no server of ours behind Check if Email is Valid. Check if Email is Valid inspects the DNS-level deliverability signals for a domain directly from your browser.
Proving a specific mailbox exists requires sending mail, which a browser cannot do, so Check if Email is Valid 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 Check if Email is Valid do?
Check if Email is Valid validates the address format and checks the domain's MX, SPF and DMARC records via DNS from your browser.
Is Check if Email is Valid free to use?
Yes — Check if Email is Valid is completely free, with no usage limits.
Where does Check if Email is Valid run its checks?
Check if Email is Valid 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 Check if Email is Valid confirm a mailbox really exists?
Check if Email is Valid 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.