How to use Bounced Email Checker
- Start by entering an email address or domain in Bounced Email Checker.
- Trigger Bounced Email Checker and it sends the DNS lookups from your browser, not from this site.
- Read the response Bounced Email Checker shows below — it comes from a public DNS resolver, not from this site.
About this tool
Bounced Email Checker runs in your browser with no backend of its own. Bounced Email Checker 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 Bounced Email Checker 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 Bounced Email Checker do?
Bounced Email Checker validates the address format and checks the domain's MX, SPF and DMARC records via DNS from your browser.
Is Bounced Email Checker free to use?
Yes — Bounced Email Checker is completely free, with no usage limits.
Where does Bounced Email Checker run its checks?
Bounced 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 Bounced Email Checker confirm a mailbox really exists?
Bounced 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.