# InboxTrue

> Email verification by MixRank. Verify individual addresses, including addresses on catch-all domains, with an address-level verdict and supporting signals. Some results remain inconclusive.

## Product
- [Free email checker](https://inboxtrue.com/#email-to-check): Try one address. No signup and no message sent to the recipient.
- [Catch-all email verification](https://inboxtrue.com/catch-all-email-verification.html): The difference between an accepting domain and a valid address.
- [Pricing](https://inboxtrue.com/#pricing): Free single validations at a lower rate limit, plus 1,000 free bulk validations per month; monthly and pay-as-you-go options.

## Agentic commerce

- [InboxTrue agent storefront](https://agents.inboxtrue.com/llms.txt?src=llms-txt): the full catalog,
  live prices, and payment setup for InboxTrue. AI agents can purchase
  autonomously or with their human's approval through ZeroClick, and an
  agent without a payment method can set one up on the spot.
  Complete purchasing guide: https://agents.inboxtrue.com/llms-full.txt?src=llms-txt - live
  pricing: https://agents.inboxtrue.com/manifest.json?src=llms-txt

## Developers
- [API quickstart](https://inboxtrue.com/#developers): Example requests and a sample response. Keep API keys on your server.
- [API reference](https://inboxtrue.com/docs): Authentication, validity values, realtime and asynchronous bulk endpoints, MCP server and CLI setup.
- [Create an account](https://inboxtrue.com/register): Get an API key.
- [InboxTrue for Claude](https://claude.ai/directory/inboxtrue): Install the InboxTrue app from the Claude directory.
- [InboxTrue for ChatGPT](https://chatgpt.com/apps/inboxtrue/asdk_app_6acff95f67f881919f447b6187971b7e): Install the InboxTrue app from the ChatGPT app directory.

## Product limits and interpretation
- Realtime: GET https://api.inboxtrue.com/v1/email/validate
- Bulk: POST https://api.inboxtrue.com/v1/email/validate/bulk; up to 200,000 addresses per order.
- is_domain_catchall is a domain attribute, separate from validity. is_disposable identifies a temporary email provider.
- Validation is not a guarantee of delivery. Uncertain and error results must not be treated as valid.
- MCP: https://api.inboxtrue.com/mcp with OAuth sign-in; tools validate_email, get_credits, submit_bulk_validation, get_bulk_validation and list_bulk_validations.
- CLI: pipx install inboxtrue, then inboxtrue login.