Self-hosted email: open-source Postfix, Mailcow, and full-stack mail server alternatives

The open-source communication infrastructure for agents and products

A fast, highly extensible, and event driven SMTP server

Mail hosting made simple

Keep passwords and other sensitive information out of your chat logs and inboxes.

Production-ready fullstack but simple mail server (SMTP, IMAP, LDAP, Antispam, Antivirus, etc.) running inside a container.

All-in-one Mail & Collaboration server. Secure, scalable and fluent in every protocol (IMAP, JMAP, SMTP, CalDAV, CardDAV, WebDAV).

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

The SimpleLogin back-end and web app

Insular email distribution - mail server as Docker images

mailcow: dockerized - + =

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

Cypht: Lightweight Open Source webmail aggregator [PHP, JS]. Supports IMAP/SMTP, JMAP and EWS (Exchange Web Services)

The open-source notification infrastructure. In-app Inbox component, E-mail, SMS, Push and Slack Integrations.

Easy to use, yet comprehensive library for sending mails with Go

a mailer library for Rust

Build and send emails using React

Composable all-in-one mail server.

The Official Twilio SendGrid Golang API Library

A fully featured open source mail delivery platform for incoming & outgoing e-mail

Event-driven networking engine written in Python.

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.

The world's best AI personal assistant for email. Open source app to help you reach inbox zero fast.

Anonymous email forwarding

Fully featured, open source, privacy friendly email app for Android