Best open-source alternatives to Mailchimp

listmonk is a self-hosted newsletter and mailing list manager intended for users who want to run email list infrastructure on their own servers. It is presented as a fast, feature-rich application that ships as a single binary and uses PostgreSQL for persistence. The project offers two documented deployment paths: Docker via a sample docker-compose file, and a direct binary installation flow that includes configuration generation and database installation or upgrade steps. A live demo and installation documentation are linked from the README, making it straightforward for operators to evaluate and deploy. The repository also notes that the backend is written in Go and the frontend uses Vue with Buefy.

BillionMail is an open-source mail server and email marketing platform aimed at businesses and individuals who want to manage outbound email campaigns on their own infrastructure. It is presented as a self-hosted solution for newsletters, promotional mail, and transactional messages, with an emphasis on full control over sending and tracking. The README highlights a simple three-step flow: install the software, connect a sending domain, and create a campaign. It also advertises advanced analytics, customer management, unlimited sending, customizable templates, and privacy-first operation. The project includes management scripts for common administrative tasks and integrates RoundCube for webmail access, suggesting it is meant to serve both as a mail system and as a practical campaign tool.

Mautic is an open source marketing automation platform intended for businesses, organizations, and contributors who want to run their own marketing campaigns without relying on third-party SaaS. It emphasizes privacy, extensibility, and ownership of data, positioning itself as a self-hosted alternative to commercial marketing automation tools. The project supports integrated, multi-channel campaign management with unlimited segmentation and automation, along with customizable frontend and backend components. The README indicates that it can be deployed through a trial, installed from source via Composer, or started locally with DDEV, and it points users to both user and developer documentation for further use and integration.

Keila is an open source newsletter platform intended as an alternative to services such as Mailchimp and Sendinblue. It is aimed at people and organizations that want to manage newsletter campaigns and sign-up forms, either through a hosted cloud offering or by self-hosting the application. The project supports sending campaigns through a user’s own email inbox for smaller newsletters, or through SMTP and several email delivery providers for larger deployments. The README also points to a screenshot of the campaign editor, suggesting a web-based interface centered on composing and managing newsletters. A hosted trial is available, and the project provides installation documentation for running it on a private server.