# Check If Email Exists

> Verify email address existence without sending mail using Rust

- Canonical URL: https://www.fosshunter.com/tools/check-if-email-exists
- JSON export: https://www.fosshunter.com/tools/check-if-email-exists.json
- Website: https://github.com/reacherhq/check-if-email-exists
- Category: Email SMTP
- Open source: yes
- Self-hostable: yes
- Verified listing: no
- Featured: no
- Published at: 2026-05-07T17:38:39+00:00
- Catalog revision: `1865733083`

## Repository metrics (point-in-time)

- Repository: https://github.com/reacherhq/check-if-email-exists
- Stars: 10413
- Forks: 777
- Open issues: 60
- License: MIT
- Last push: 2026-10-30T17:21:24+00:00
- Metrics observed at (synced_at): 2026-11-04T11:54:51+00:00
- Archived: no

Tags: Email SMTP, Email Verification API, Email Validation API, Email Verifier, Email Verification, Email Validation
Tech stacks: docker, postgresql, rust, Warp

## Features
- Validates email existence without sending actual messages by performing deep SMTP checks. *(highlighted)*
- Includes a high-performance HTTP backend compatible with Docker for easy integration. *(highlighted)*
- Provides a standalone CLI tool for local email validation directly from the terminal. *(highlighted)*

## Description

Check If Email Exists is a high performance utility for validating email inboxes without sending messages. It features a robust HTTP backend and CLI written in Rust to perform deep SMTP verification and syntax checks at scale.

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Source: [FOSSHunter — Check If Email Exists](https://www.fosshunter.com/tools/check-if-email-exists) — cite `synced_at` and the catalog revision when quoting metrics.
Interpretation rules: https://www.fosshunter.com/llms-full.txt