There are 2 open-source alternatives to Mailu in this directory. The most popular is Docker-mailserver with 18.1k GitHub stars, followed by Stalwart(12.3k stars). All are open source, free to use, and many can be self-hosted.
| # | Tool | Stars | Language | License |
|---|---|---|---|---|
| 1 | Docker-mailserver A production-ready, fullstack mail server solution featuring SMTP, IMAP, LDAP, Antispam, and Antivirus functionalities, all running seamlessly inside a container. Designed for simplicity and ease of setup with robust security and reliability. | 18.1k | Shell | MIT License |
| 2 | Stalwart Stalwart is an all-in-one mail and collaboration server designed to be secure, scalable, and highly compatible with a wide range of protocols including IMAP, JMAP, SMTP, CalDAV, CardDAV, and WebDAV. It provides enterprise-class communication and groupware functionality in a single unified solution. | 12.3k | Rust | — |
A production-ready, fullstack mail server solution featuring SMTP, IMAP, LDAP, Antispam, and Antivirus functionalities, all running seamlessly inside a container. Designed for simplicity and ease of setup with robust security and reliability.
Stalwart is an all-in-one mail and collaboration server designed to be secure, scalable, and highly compatible with a wide range of protocols including IMAP, JMAP, SMTP, CalDAV, CardDAV, and WebDAV. It provides enterprise-class communication and groupware functionality in a single unified solution.
The top three are Docker-mailserver(18.1k stars), Stalwart(12.3k 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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