Email Validation
Verify deliverability with syntax, MX/DNS, disposable and typo checks. Free online checker. also available via REST API & MCP.
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Validate emails via API & MCP
Use the same check in your product, signup or CRM. It checks syntax, mail servers, disposable addresses and typos in one call. One credit per email.
curl -X GET "https://firmafind.at/api/email/[email protected]" \
-H "x-api-key: YOUR_API_KEY"
# POST alternative
curl -X POST "https://firmafind.at/api/email/validate" \
-H "x-api-key: YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{"email":"[email protected]"}'What does the email validation check?▾
Syntax and format, whether the domain has mail servers, whether the provider is known for disposable addresses, whether it is a role address like admin@ or support@, and whether the domain looks like a typo of a common provider.
Is SMTP mailbox verification performed?▾
No. The check uses only syntax and DNS. It does not send an email or open an SMTP connection. That avoids privacy problems and rate limits, and it still catches most undeliverable addresses.
Can I validate emails via API?▾
Yes. Send a GET or POST request to /api/email/validate with your x-api-key header. Each call costs one credit. You can use it for signup forms, CRM cleanup or lead checks.
Is bulk validation supported?▾
Not as a single bulk endpoint yet. Call the API once per email. You can run many requests in parallel, within your limit of 120 per minute on paid plans.
Heuristic check: syntax + DNS/MX, no SMTP mailbox probe. Results are indicative and do not guarantee inbox placement. For critical workflows, combine with double opt-in.