Best Open-source Email Testing & Sandbox Inboxes tools

Explore curated open-source tools in the Email Testing & Sandbox Inboxes category. Compare technologies, see alternatives, and find the right solution for your workflow.

8 projects · Page 1 of 1

Smtp4dev

Advanced fake SMTP server for realistic email testing

Email Testing & Sandbox Inboxes

Stars: 3,771
License: BSD-3-Clause
Last commit: 1 day ago

C#Active

Mailpit

Fast, zero-dependency email testing tool for developers

Email Testing & Sandbox Inboxes

Stars: 8,538
License: MIT
Last commit: 3 days ago

GoActive

MailDev

Local SMTP server for testing emails during development

Email Testing & Sandbox Inboxes

Stars: 5,802
License: MIT
Last commit: 3 days ago

SCSSActive

MailCrab

Lightweight Rust‑based email sandbox with web UI and API

Email Testing & Sandbox Inboxes

Stars: 931
License: Apache-2.0
Last commit: 15 days ago

RustActive

Papercut

Desktop SMTP server and email viewer for development

Email Testing & Sandbox Inboxes

Stars: 3,258
License: —
Last commit: 29 days ago

C#Active

Inbucket

Disposable email testing server with zero external dependencies

Email Testing & Sandbox Inboxes

Stars: 1,977
License: MIT
Last commit: 1 month ago

GoActive

MailCatcher

Capture and view outgoing email locally via a simple web UI

Email Testing & Sandbox Inboxes

Stars: 6,720
License: MIT
Last commit: 1 year ago

RubyDormant

MailHog

Lightweight email testing tool with web UI and API

Email Testing & Sandbox Inboxes

Stars: 15,675
License: MIT
Last commit: 1 year ago

GoDormant