Looking for an open-source alternative to Mail-in-a-Box? Below are 4 community-built tools that offer similar functionality — all free, open source, and ready to use or self-host. Ranked by GitHub stars.
mailcow-dockerized is a modern, user-friendly, open source mail server suite based on Docker, offering a complete mail solution with advanced security, convenient web interfaces, and easy deployment.
BillionMail is an open-source, fully self-hosted mail server solution with integrated newsletter and email marketing capabilities. It is designed for developers and businesses seeking powerful, flexible, and cost-effective alternatives to proprietary mailing platforms without any recurring fees.
BillionMail provides an open-source MailServer solution with NewsLetter and Email Marketing capabilities—fully self-hosted, developer-friendly, and free from monthly fees.
Modoboa is an open-source platform that simplifies mail hosting by providing a modern and user-friendly web interface for managing email domains, mailboxes, and aliases. It features integrated administration, security enhancements, and extensibility for hassle-free email server management.
The top picks from this list are Mailcow-dockerized, BillionMail, BillionMail — all maintained, free to use, and self-hostable.
Yes. Every tool listed here is open source and free to use. Many can be self-hosted on your own infrastructure, which means no subscription fees and full control over your data.
Most of the alternatives listed are self-hostable. Check each tool's page for hosting details, system requirements, and licensing terms.
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