listmonk

Listmonk is a free, open-source, self-hosted newsletter and mailing list management tool. It is aimed at users who are looking for an efficient solution for sending transactional emails. Listmonk offers features such as the management of millions of subscribers, the ability to send transactional messages via predefined templates, simple analytics and visualizations, and a powerful email template creation. The tool is free and open-source. There are no pricing information as the product is freely available.