Privacy Policy

Last updated: June 2026

What we process

To verify an address, MailCheck processes the email address (or a name + domain for the Finder) and performs DNS lookups and an SMTP handshake with the destination mail server. We retain the verification verdict, a confidence score and metadata (status, MX record, timestamps) so results can be cached and re-downloaded.

What we never do

• We never send an email to the address during verification — the check stops before any message is delivered.
• We never read, request or store the content of any email.
• We never sell your lists or verification data.

Account data

We store your account email, a salted password hash, your API keys and your usage history. You control your API keys and can revoke them at any time.

Caching & retention

Verification results are cached for a configurable period to make repeat checks fast and to reduce load on destination servers. You can delete bulk jobs and their results from your dashboard.

Security

Passwords are hashed with scrypt. API keys are random, high-entropy tokens. Self-hosted deployments keep all data inside your own infrastructure.

Contact

For privacy questions or data deletion requests, reach out through your account dashboard.