Sendmail - Message transfer agent (MTA). Sendmail C/deb
Mailman - The Gnu mailing list server.
SimpleLogin - Open source email alias solution to protect your email address. Comes with browser extensions and mobile apps. MIT Docker/Python
Protect your real email address using email aliases
Roundcube - Browser-based IMAP client with an application-like user interface. GPL-3.0 PHP/deb
Mautic - Mautic is marketing automation software (email, social and more). GPL-3.0 PHP
Mailcow - Mail server suite based on Dovecot, Postfix and other open source software, that provides a modern Web UI for administration. GPL-2.0 Docker/PHP
Postfix - Fast, easy to administer, and secure Sendmail replacement. IPL-1.0 C/deb
iRedMail - Full-featured mail server solution based on Postfix and Dovecot. GPL-3.0 Shell
Dovecot - IMAP and POP3 server written primarily with security in mind. MIT/LGPL-2.1 C/deb
Mail-in-a-Box - Turns any Ubuntu server into a fully functional mail server with one command. CC0-1.0 Shell
Postorius - Web user interface to access GNU Mailman. GPL-3.0 Python
docker-mailserver - Production-ready fullstack but simple mail server (SMTP, IMAP, LDAP, Antispam, Antivirus, etc.) running inside a container. Only configuration files, no SQL database. MIT Docker
Listmonk - High performance, self-hosted newsletter and mailing list manager with a modern dashboard. AGPL-3.0 Go/Docker
Exim - Message transfer agent (MTA) developed at the University of Cambridge. GPL-3.0 C/deb
Mailu - Mailu is a simple yet full-featured mail server as a set of Docker images. MIT Docker/Python
chasquid - SMTP (email) server with a focus on simplicity, security, and ease of operation.
AnonAddy - Open source email forwarding service for creating aliases.
SquirrelMail - Another browser-based IMAP client.
Postal - A complete and fully featured mail server for use by websites & web servers. MIT Docker/Ruby
HyperKitty - Open source Django application to provide a web interface to access GNU Mailman v3 archives. GPL-3.0 Python
Inboxen - Inboxen is a service that provides you with an infinite number of unique inboxes. GPL-3.0 Python
Modoboa - Modoboa is a mail hosting and management platform including a modern and simplified Web User Interface. ISC Python
MailCatcher - Ruby gem that deploys a simply SMTP MTA gateway that accepts all mail and displays in web interface. Useful for debugging or development. MIT Ruby
SnappyMail - Simple, modern, lightweight & fast web-based email client (fork of RainLoop). AGPL-3.0 PHP
Dada Mail - Web-based list management system that can be used for announcement lists and/or discussion lists. GPL-2.0 Perl
phpList - Newsletter and email marketing with advanced management of subscribers, bounces, and plugins. AGPL-3.0 PHP
Cypht - Feed reader for your email accounts.
Piler - Feature-rich email archiving solution. GPL-3.0 C
wildduck - Scalable no-SPOF IMAP/POP3 mail server. EUPL-1.2 Nodejs/Docker
OpenSMTPD - Secure SMTP server implementation from the OpenBSD project. ISC C/deb
DebOps - Your Debian-based data center in a box. A set of general-purpose Ansible roles that can be used to manage Debian or Ubuntu hosts. GPL-3.0 Ansible/Python
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