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Check an email before you use it.

Check the address format, domain mail routing and disposable-provider signals. Free, with no account or API key.

Your address is sent to Heffl for checking. The recipient mail server may be contacted for a mailbox check. No email is sent. Submitted addresses are not stored by this tool.

What does email validation prove?

A valid format and a mail-enabled domain do not prove that a particular inbox exists. Mailbox checks may be unavailable, blocked, or inconclusive. The result shows exactly which checks ran.

Disposable, personal-provider and role-address flags describe the address. They do not automatically make it invalid. Gmail addresses and support inboxes can receive mail.

Use it in your app or assistant

Call the free HTTP API or connect an MCP-compatible assistant. Both use the same verification engine and require no Heffl login.

API documentation and AI assistant setup →

30 requests per minute per IP per server instance. Capacity limits also apply. Checks provide current evidence, not a promise of delivery or proof of ownership.

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