Last updated: September 2026
The short version
Email addresses you check on this site are processed in your browser and are never sent to us. We cannot see, log, store or sell them, because they never leave your device.
On-site checkers
The single and bulk checkers download our domain blocklists to your browser and classify your input locally. The optional MX check queries Cloudflare's public DNS-over-HTTPS resolver (1.1.1.1) directly from your browser; that request goes to Cloudflare, not to us, and contains only the domain. Closing the tab destroys all data.
API
The public API accepts domains. If a full address is sent, the part before the @ is discarded before any processing. Responses carry no-store headers; request inputs are not written to logs. Standard web-server logs record IP addresses and request timing for rate limiting and abuse prevention, retained briefly and automatically rotated.
Analytics and cookies
We use Google Analytics to understand aggregate traffic (pages visited, country, device type). No account system, no marketing cookies, no data sales. The theme preference (light/dark) is stored in your browser's localStorage and never transmitted.
Contact
Questions or corrections: [email protected]. EmailDomainCheck.com is operated by IPNOVA SYSTEMS LTD, Cyprus.