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

The classic email sending library for PHP

😱 Falsehoods Programmers Believe in

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

MJML: the only framework that makes responsive-email easy

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

Comprehensive mailing tools for PHP

💌 A beautiful, fast and maintained fork of @nylas Mail by one of the original authors.

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

K-9 Mail – Open Source Email App for Android

HEML is an open source markup language for building responsive email.

A few simple, but solid patterns for responsive HTML email templates and newsletters. Even in Outlook and Gmail.

An open source email campaign management tool for nonprofits

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

Tutanota is an email client with a strong focus on security and privacy that lets you encrypt emails on all your devices.

Prometheus Alertmanager

A Grunt workflow for designing and testing responsive HTML email templates with SCSS.

📫 Create, preview, and send custom email templates for Node.js. Highly configurable and supports automatic inline CSS, stylesheets, embedded images and fonts, and much more!

Juice inlines CSS stylesheets into your HTML source.

✉️ 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.

Drag-n-Drop Email Editor Component for React.js

The missing desktop client for Gmail & Google Inbox

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

Insular email distribution - mail server as Docker images

Golang package that generates clean, responsive HTML e-mails for sending transactional mail

A list of amazing Newsletters

Send email in Python conveniently for gmail using yagmail

📫 A serverless email server on AWS using S3 and SES

Low Code Open Source Framework in Python and JS