Discover the Best Open-Source Email Projects Sorted by Stars

:love_letter: An extensible desktop mail app built on the modern web. Forks welcome!

🔥 The open-source notification infrastructure with fully functional embedded notification center 🚀🚀

😱 Falsehoods Programmers Believe in

The classic email sending library for PHP

✉️ Send e-mails with Node.JS – easy as cake!

MJML: the only framework that makes responsive-email easy

:love_letter: A beautiful, fast and fully open source mail client for Mac, Windows and Linux.

A free simple responsive HTML email template

Mail-in-a-Box helps individuals take back control of their email by defining a one-click, easy-to-deploy SMTP+everything else server: a mail server in a box.

High performance, self-hosted, newsletter and mailing list manager with a modern dashboard. Single binary app.

PHP Email address validator

Open source alternative to Auth0 / Firebase Auth / AWS Cognito

Comprehensive mailing tools for PHP

E-mails, subdomains and names Harvester - OSINT

K-9 Mail – Open Source Email App for Android

Free and Open Source messaging and emailing app that combines common web applications into one.

🧑‍🚀 Logto is a modern Auth0 alternative for building identity infrastructure with minimal effort, for both your customers and their organizations.

Mautic: Open Source Marketing Automation Software.

Prometheus Alertmanager

Low code web framework for real world applications, in Python and Javascript