EmailKind

Key features

• Detects the specific email provider for a given address, including over 150 services.
• Classifies email addresses as business, personal, disposable, education, hosting, or self-hosted.
• Enriches company data by resolving custom domains to company names using SSL, RDAP, and metadata.
• Detects and names security gateways, revealing the mailbox provider behind them when possible.
• Provides a confidence score for each classification result.
• Supports batch processing and CSV uploads for bulk email classification.
• Offers official SDKs for Python, Node.js, and Go, plus HTTP API access.
• Integrates with AI agents via a native Model Context Protocol (MCP) server.

Use cases

• Qualifying B2B signups by routing business emails to sales teams.
• Auto-filling company names in CRMs using email domain enrichment.
• Blocking disposable or risky signups to prevent trial abuse and fake accounts.
• Segmenting users by email provider for analytics or marketing.
• Dedupe and flag shared inboxes by normalizing email addresses.
• Spotting enterprise leads by detecting security gateways and mailbox providers.

Pros

• Free tier with 100 requests per month and no credit card required.
• Passive DNS analysis only, with no contact to mail servers.
• Fast API response times, typically under 50ms.
• Bulk CSV upload and batch API endpoint for large-scale classification.

Limitations

• Unused requests do not roll over to the next billing cycle.

Screenshots