reacherhq/check-if-email-exists

Health v2 · maintenance only

Flags: no_license

Adoption not part of the score

9485 stars · 685 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

A Rust library and CLI that checks whether an email address exists via SMTP/MX lookups without sending an actual email. It also ships as a Dockerized HTTP backend exposing an email verification API.

Use cases

• verify if an email address exists before sending
• check email deliverability without sending email
• self-hosted email verification API
• validate email syntax and MX records
• detect disposable or catch-all email addresses
• clean up a mailing list of invalid emails

When to choose

• you need SMTP-level email verification without sending messages
• you want a self-hosted alternative to paid email verification services
• you need both a Rust library and an HTTP API from one project

When to avoid

• you only need simple syntax validation - a regex or lightweight validator suffices
• you cannot open outbound port 25 or run SMTP proxies
• you need high-volume verification without proxy infrastructure

Facets

library · maturity active

email http-server cli api-framework email developer-tools backend apis rust cli cross-platform self-hosted email-verification smtp mx-lookup email-validation disposable-email-detection docker

Member repositories

For agents

markdown · JSON · MCP: product_card(name="reacherhq/check-if-email-exists")