Mailtrain - Self Hosted Newsletter App Built on Top of Nodemailer.

iRedMail - Free, Open Source Mail Server Solution

I red mail free open source mail server solution

Mail-in-a-Box

Take back control of your email with this easy to deploy mail server in a box

mailcow.email | The mailserver suite with the ‘moo’ – 🐮 + 🐋 = 💕

Open Source Marketing Automation - Mautic Community

Mautic provides free and open source marketing automation software available to everyone free email marketing software lead management software and more

Modoboa

Modoboa is an open source email server including a modern and simplified web user interface

Poste.io ~ complete mail server

Full featured solution for your email server native implementation of last anti spam metods webmail and easy administration included

GitHub - simple-login/app: The SimpleLogin back-end

The simple login back end contribute to simple login app development by creating an account on git hub