Open source email-verification projects
Every project in the registry tagged email-verification, ranked by real GitHub adoption.
Sellbird (formerly Harvey): the open-source outreach platform that runs on your Claude or ChatGPT plan. Finds companies and decision makers, verifies emails, wr
Autonomous AI sales agent powered by Claude Code or Codex. Finds prospects, writes cold emails, sends campaigns, handles replies, books meetings. No API keys ne
Free email OSINT tool, 5000+ platforms, identity clustering, breach detection. No API keys required. pip install mailaccess
Frequently asked questions
How many open source email-verification projects are there?
This registry tracks 3 projects tagged email-verification, with 11,311 GitHub stars between them. The most-adopted is sellbird at 4,775 stars.
Are these email-verification projects free to use?
Yes — 3 of the 3 carry an explicit open-source licence across 2 distinct licences, so there is no licence fee. Where a project also sells a hosted or enterprise version, the self-hosted path remains free.
Which email-verification project should I choose?
The list above is ranked by GitHub stars, but stars measure attention rather than fit. Check three things on each card: the licence (permissive versus copyleft), the language it is written in, and the last-push date — a high-star project that has not been pushed in a year is a liability.
Are these email-verification projects still maintained?
3 of the 3 were pushed in the last 90 days, and every card shows its exact last-push date so you can see the rest. Sort your shortlist by that date before committing to a migration.