The classic email sending library for PHP

A free simple responsive HTML email template

Open-Source Notification Platform. Embeddable Notification Center, E-mail, Push and Slack Integrations.

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

Thunderbird for Android – Open Source Email App for Android (fka K-9 Mail)

Prometheus Alertmanager

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.

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

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

CloudFlare free temp domain email 免费收发 临时域名邮箱 支持附件 IMAP SMTP TelegramBot

MJML: the only framework that makes responsive-email easy

📧 An Example of using an HTML form (e.g: "Contact Us" on a website) to send Email without a Backend Server (using a Google Script) perfect for static websites that need to collect data.

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

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.

Comprehensive mailing tools for PHP

Insular email distribution - mail server as Docker images

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

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.

The Official Twilio SendGrid Led, Community Driven Node.js API Library