Self-hosted Communication - Email - Mail Transfer Agents software
Mail Transfer Agents (MTAs) - SMTP servers.
9 projects, sorted by GitHub stars (as recorded in the dataset). Star counts and dates come from the dataset snapshot, not live.
| Name | Description | License | Stars | Updated | Platforms | |
|---|---|---|---|---|---|---|
| Haraka | Fast, highly extensible, and event driven SMTP server. | MIT | 5,621 | 2026-10-17 | Nodejs | Source |
| OpenSMTPD | Secure SMTP server implementation from the OpenBSD project. | ISC | 586 | 2026-09-14 | C, deb | Source |
| DragonFly | A small MTA for home and office use. Works on Linux and FreeBSD. | BSD-3-Clause | 266 | 2026-08-30 | C | Source |
| chasquid | SMTP (email) server with a focus on simplicity, security, and ease of operation. | Apache-2.0 | — | — | Go | Source |
| Courier MTA | Fast, scalable, enterprise mail/groupware server providing ESMTP, IMAP, POP3, webmail, mailing list, basic web-based calendaring and scheduling services. | GPL-3.0 | — | — | C, deb | Source |
| EmailRelay | A small and easy to configure SMTP and POP3 server for Windows and Linux. | GPL-3.0 | — | — | C++ | Source |
| Exim | Message transfer agent (MTA) developed at the University of Cambridge. | GPL-3.0 | — | — | C, deb | Source |
| Postfix | Fast, easy to administer, and secure Sendmail replacement. | IPL-1.0 | — | — | C, deb | Source |
| Sendmail | Message transfer agent (MTA). | Sendmail | — | — | C, deb | Source |