smtp-verification

Free B2B email finder & verification MCP server. Find, verify, and enrich business emails without paid API subscriptions. Self-contained DNS/SMTP verification. Hunter.io alternative for AI agents.

Open-source Apollo alternative: cold-outreach engine that verifies every mailbox before sending. Email discovery, SMTP verification, bounce-proof delivery. Self-hosted or hosted. Free Hunter.io / Instantly / Clay alternative.

Top Email Verification API (Opensource) 🌟 Star if you like it! 🌟

VerifHub AI — Live SMTP email verification, live HLR carrier lookups and breach screening — 99.2% accuracy, 4,800 records a minute, 190+ countries, prepaid per record.

Go Email Verifier

📫 Asynchronous email deliverability verifier that performs MX lookups, SMTP RCPT probes, and catch-all detection with retries, resume support, and CSV/JSON reporting.

Bulk email validation: MX, SMTP, disposable, catch-all detection. Python, Node.js and cURL clients for the Email Verifier & Validator on Apify, pay per result.