List of Top Free Open Source & Self Hosted Application for Communication - Email - Complete Solutions

Simple deployment of E-mail servers, e.g. for inexperienced or impatient admins.

AnonAddy – Open source email forwarding service for creating aliases. MIT PHP
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-only YAML/Ansible/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
emailwiz – Luke Smith’s bash script to completely automate the setup of a Postfix/Dovecot/SpamAssassin/OpenDKIM server on debian. GPL-3.0 Bash
Excision Mail – Fullstack, security focused mailserver based on OpenSMTPD for OpenBSD using ansible. ISC Shell/Ansible
homebox – Suite of Ansible scripts to deploy a fully functional mail server on Debian. Unobtrusive and automatic as much as possible, focusing on stability and security. GPL-3.0 Shell
Inboxen – Inboxen is a service that provides you with an infinite number of unique inboxes. GPL-3.0 Python
iRedMail – Full-featured mail server solution based on Postfix and Dovecot. GPL-3.0 Shell
Maddy Mail Server – All-in-one mail server that implements SMTP (both MTA and MX) and IMAP. Replaces Postfix, Dovecot, OpenDKIM, OpenSPF, OpenDMARC with single daemon. GPL-3.0 Go
Mail-in-a-Box – Turns any Ubuntu server into a fully functional mail server with one command. CC0-1.0 Shell
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
Mailu – Mailu is a simple yet full-featured mail server as a set of Docker images. MIT Docker/Python
Modoboa – Modoboa is a mail hosting and management platform including a modern and simplified Web User Interface. ISC Python
Postal – A complete and fully featured mail server for use by websites & web servers. MIT Docker/Ruby
Simple NixOS Mailserver – Complete mailserver solution leveraging the Nix Ecosystem. GPL-3.0 Nix
SimpleLogin – Open source email alias solution to protect your email address. Comes with browser extensions and mobile apps. MIT Docker/Python
wildduck – Scalable no-SPOF IMAP/POP3 mail server. EUPL-1.2 Nodejs