Production-ready fullstack but simple mail server (SMTP, IMAP, LDAP, Antispam, Antivirus, etc.) running inside a container.
Mail servers
Host email for your own domains.
Changes in this category (RSS)
Side by side
| Tool | Stars | Licence | Terms | Self-hosted | Language | Latest | Last push |
|---|---|---|---|---|---|---|---|
| docker-mailserver | 19k | MIT | Open source | Yes | Shell | v16.0.1 | 2026-10-04 |
| Postal | 17k | MIT | Open source | Yes | Ruby | 3.3.7 | 2026-10-06 |
| Mail-in-a-Box | 15k | CC0-1.0 | Not checked | Yes | Python | v77 | 2026-09-26 |
| Stalwart | 15k | None detected | Open core | Yes | Rust | v0.16.25 | 2026-10-05 |
| mailcow | 14k | GPL-3.0 | Open source | Yes | JavaScript | 2026-09a | 2026-10-06 |
| Mailu | 7.5k | Other | Open source | Yes | Python | 2024.06.61 | 2026-10-06 |
| Maddy | 6.1k | GPL-3.0 | Open source | Yes | Go | v0.9.6 | 2026-10-03 |
| Mox | 5.9k | MIT | Open source | Yes | Go | v0.0.17 | 2026-09-13 |
| Haraka | 5.6k | MIT | Open source | Yes | JavaScript | v3.3.4 | 2026-10-03 |
| Modoboa | 3.5k | ISC | Open source | Yes | Python | 2.11.0 | 2026-10-06 |
| Rspamd | 2.5k | Other | Open source | Yes | C | 4.2.1 | 2026-10-04 |
| WildDuck | 2.1k | EUPL-1.2 | Open source | Yes | JavaScript | v1.51.4 | 2026-10-06 |
| iRedMail | 1.8k | GPL-3.0 | Open source | Yes | Shell | 1.8.8 | 2026-09-23 |
| Dovecot | 1.3k | Other | Open source | Yes | C | 2.4.5 | 2026-10-06 |
| PostfixAdmin | 1.3k | Other | Open source | Yes | PHP | v4.0.5 | 2026-10-04 |
| Apache James | 1k | Apache-2.0 | Open source | Yes | Java | james-project-3.9.1 | 2026-10-06 |
| chasquid | 978 | Other | Open source | Yes | Go | v1.18.0 | 2026-10-04 |
| Hyvor Relay | 911 | AGPL-3.0 | Open source | Yes | PHP | 0.0.46 | 2026-09-30 |
| Cyrus IMAP | 652 | Other | Open source | Yes | C | cyrus-imapd-3.12.4 | 2026-10-06 |
| OpenSMTPD | 586 | Other | Open source | Yes | C | 7.9.0p0 | 2026-09-14 |
| chatmail relay | 489 | MIT | Open source | Yes | Python | 1.13.0 | 2026-10-01 |
21 tools
📮 A fully featured open source mail delivery platform for incoming & outgoing e-mail
Mail-in-a-Box helps individuals take back control of their email by defining a one-click, easy-to-deploy SMTP+everything else server: a mail server in a box.
All-in-one Mail & Collaboration server. Secure, scalable and fluent in every protocol (IMAP, JMAP, SMTP, CalDAV, CardDAV, WebDAV).
mailcow: dockerized - 🐮 + 🐋 = 💕
- Language
- JavaScript
- Licence
- GPL-3.0
- Stars
- 14k
- Latest
- 2026-09a
- Last push
- 2026-10-06
Insular email distribution - mail server as Docker images
- Language
- Python
- Licence
- Other
- Stars
- 7.5k
- Latest
- 2024.06.61
- Last push
- 2026-10-06
✉️ Composable all-in-one mail server.
modern full-featured open source secure mail server for low-maintenance self-hosted email
A fast, highly extensible, and event driven SMTP server
- Language
- JavaScript
- Licence
- MIT
- Stars
- 5.6k
- Latest
- v3.3.4
- Last push
- 2026-10-03
Mail hosting made simple
Rapid spam filtering system.
Opinionated email server
- Language
- JavaScript
- Licence
- EUPL-1.2
- Stars
- 2.1k
- Latest
- v1.51.4
- Last push
- 2026-10-06
Full-featured, open source mail server solution for mainstream Linux/BSD distributions.
Dovecot mail server
PostfixAdmin - web based virtual user administration interface for Postfix mail servers
Emails at the heart of your business logic!
- Language
- Java
- Licence
- Apache-2.0
- Stars
- 1k
- Latest
- james-project-3.9.1
- Last push
- 2026-10-06
SMTP (email) server with a focus on simplicity, security, and ease of operation [mirror]
📨 Open-Source Email API for Developers. Cloud & Self-hosted Alternative to SES, Mailgun, SendGrid.
Cyrus IMAP is an email, contacts and calendar server
- Language
- C
- Licence
- Other
- Stars
- 652
- Latest
- cyrus-imapd-3.12.4
- Last push
- 2026-10-06
This is official OpenSMTPD Portable repository. Forks, pull requests and other contributions are welcome!
chatmail service deployment scripts and docs