BillionMail

BillionMail is an open-source mail server and email marketing platform for sending newsletters, promotional emails, and transactional messages. It is built for people who want to manage email campaigns with full control and avoid monthly fees.

It supports email sending and tracking, with advanced analytics and customer management for campaigns. Installation is available with Docker or a shell install script, and the setup flow is designed to get to successful email sending in 8 minutes.

BillionMail is licensed under AGPLv3. It is self-hosted and run from your own infrastructure, with a focus on email server and marketing use cases rather than a hosted service.