The MailboxValidator Free Email Checker checks if a single email address is from a free email provider and returns the results in either JSON or XML format. Refer to https://www.mailboxvalidator.com/api-email-freem for further information.
Trust signals
Pricing
UNKNOWN
Auth
UNKNOWN
CORS
Yes
Rate limit
Unknown
Health
281ms
Trust score
89 (B)
Last checked Oct 19, 2026 · uptime 24h 100% / 7d 100% / 30d 100%
Strong candidate; weakest signal is auth clarity.
Links
- Documentationmailboxvalidator.com
- Base URLapi.mailboxvalidator.com
- OpenAPI specapi.apis.guru/v2/specs/mailboxvalidator.com/checker/1.0.0/openapi.json
Integration checklist
- Auth is UNKNOWN
- CORS enabled — callable directly from browsers.
- Rate limit: not documented