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Reacher — check-if-email-exists

https://github.com/reacherhq/check-if-email-exists

september 2026 ‧ opensource ‧ open in karakeep

by reacherhq ‧ GitHub ‧ saved copy from 2026.09.02

Checks whether an email address exists without sending a message — via SMTP validation and DNS records. It tells you if the mailbox is active, whether it is full and whether the address is disposable.

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The GitHub project "check-if-email-exists" is an open-source Rust tool that verifies the existence of an email address without sending any email. It offers three main usage methods: a Docker-based HTTP backend, a CLI binary, and integration as a Rust library. The tool performs various checks including syntax validation, MX DNS record verification, SMTP server responsiveness, detect disposable or role accounts, and mailbox status. Additionally, a SaaS version with a user-friendly web interface is available, providing a commercial alternative to paid email verification services.

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Check if an email address exists without sending any email, written in Rust. Comes with a ⚙️ HTTP backend. - reacherhq/check-if-email-exists

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