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

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

😱 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

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

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.

A free simple responsive HTML email template

PHP Email address validator

Comprehensive mailing tools for PHP

K-9 Mail – Open Source Email App for Android

🧑‍🚀 The better identity infrastructure for developers and the open-source alternative to Auth0.

一键自动化 下载、安装、激活 Office 的利器。

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

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

holehe allows you to check if the mail is used on different sites like twitter, instagram and will retrieve information on sites with the forgotten password function.

Prometheus Alertmanager

A cross-platform .NET library for IMAP, POP3, and SMTP.

Tuta is an email service with a strong focus on security and privacy that lets you encrypt emails, contacts and calendar entries on all your devices.