How is classification different from email verification?

Verification checks if a mailbox exists via SMTP probes, while EmailKind identifies the provider and address type using only public DNS records. The two are complementary.

What happens when the monthly limit is reached?

The API returns a 429 HTTP response, and the plan can be upgraded instantly from the dashboard with prorated billing.

Does it support bulk classification?

Yes, paid plans can upload a CSV of up to 10,000 emails or domains or use the batch API endpoint, with results downloadable as CSV.

Where does the API run?

It runs on dedicated infrastructure in Germany, with cached DNS results giving sub-50ms average response times.

EmailKind

Email classification API: identify the provider behind any email (Google Workspace, Microsoft 365, 150+ others), business vs personal, and the company behind the domain. MCP-native.

Category:

Builders

Maker:

Renaud Roussy

Use Cases

SaaS

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About EmailKind

EmailKind is an email classification API that identifies what kind of mailbox an address belongs to rather than whether it exists. A single call returns the provider behind the domain (Google Workspace, Microsoft 365, Zoho and 150+ others), whether the address is business, personal, disposable, education, hosting or self-hosted, a confidence score, and the company that owns a custom domain.

It works through passive DNS analysis of MX and SPF records, matched against a domain database updated daily, so no emails are sent and no mail servers are contacted. It can distinguish free Gmail from Google Workspace, name security gateways such as Proofpoint or Mimecast along with the mailbox provider behind them when SPF reveals it, and normalize Gmail aliases. Official SDKs cover Python, Node.js and Go, and an official MCP server lets tools like Claude Desktop, Cursor and Windsurf call it directly.

Typical uses include qualifying B2B signups, auto-filling company names in a CRM, blocking disposable or role addresses at registration, and segmenting users by email provider. Batch processing, CSV uploads of up to 10,000 emails, webhooks and audit logs are available on paid plans.

Best for

SaaS teams qualifying B2B signups
Products fighting free-trial abuse
Developers enriching CRM leads
AI agent builders using MCP

Pros

Passive DNS analysis, no SMTP probes sent
Distinguishes Google Workspace from free Gmail
Official SDKs for Python, Node.js and Go plus MCP server
Free tier of 100 requests/month, no credit card

Cons

Does not verify whether a mailbox exists
Unused requests do not roll over between billing cycles
Batch, CSV upload and custom rules require a paid plan

Pricing

Free plan with 100 requests/month, paid plans at $14 (5,000), $34 (25,000) and $79 (100,000 requests/month), plus custom Enterprise pricing.

EmailKind FAQ

How is classification different from email verification?: Verification checks if a mailbox exists via SMTP probes, while EmailKind identifies the provider and address type using only public DNS records. The two are complementary.
What happens when the monthly limit is reached?: The API returns a 429 HTTP response, and the plan can be upgraded instantly from the dashboard with prorated billing.
Does it support bulk classification?: Yes, paid plans can upload a CSV of up to 10,000 emails or domains or use the batch API endpoint, with results downloadable as CSV.
Where does the API run?: It runs on dedicated infrastructure in Germany, with cached DNS results giving sub-50ms average response times.