There are 4 open-source alternatives to Mail-in-a-Box in this directory. The most popular is Mailcow-dockerized with 12.5k GitHub stars, followed by BillionMail(12.4k stars). All are open source, free to use, and many can be self-hosted.
| # | Tool | Stars | Language | License |
|---|---|---|---|---|
| 1 | Mailcow-dockerized 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. | 12.5k | JavaScript | GNU General Public License v3.0 |
| 2 | BillionMail 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. | 12.4k | Go | GNU Affero General Public License v3.0 |
| 3 | BillionMail BillionMail provides an open-source MailServer solution with NewsLetter and Email Marketing capabilities—fully self-hosted, developer-friendly, and free from monthly fees. | 8.3k | Go | GNU Affero General Public License v3.0 |
| 4 | Modoboa 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. | 3.5k | Python | ISC License |
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 three are Mailcow-dockerized(12.5k stars), BillionMail(12.4k stars), BillionMail(8.3k stars). All are open source and free to use.
Yes. Every tool listed here is open source and free to use in your own projects. Many can be self-hosted on your own infrastructure, which means no subscription fees and full control over your data.
Many of the alternatives listed are self-hostable. Each tool's page lists hosting details, system requirements, and licensing terms.
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