# Open-source mail server software

10 open-source mail server software rated against public privacy criteria.

1. [Dovecot](https://privacyratings.com/mail-server-software/dovecot/): A (90/100). IMAP and POP3 server for Linux and Unix that stores and serves mailboxes, with support for Sieve filtering through Pigeonhole. The Community Edition is open source.
2. [Docker Mailserver](https://privacyratings.com/mail-server-software/docker-mailserver/): B (80/100). Self-hosted mail server in a single Docker container, with SMTP, IMAP, POP3, spam and virus filtering, configured through files and environment variables.
3. [iRedMail](https://privacyratings.com/mail-server-software/iredmail/): B (80/100). Installer script that sets up a complete mail server on Linux or BSD from open-source components such as Postfix, Dovecot, Roundcube and SpamAssassin.
4. [Maddy](https://privacyratings.com/mail-server-software/maddy/): B (80/100). All-in-one mail server written in Go that replaces Postfix, Dovecot and OpenDKIM with a single daemon, handling SMTP, IMAP, DKIM, SPF, DMARC, DANE and MTA-STS.
5. [Mail-in-a-box](https://privacyratings.com/mail-server-software/mail-in-a-box/): B (80/100). Self-hosted mail server setup for a single Ubuntu machine, with SMTP, IMAP, webmail, contacts, calendar, spam filtering and backups preconfigured.
6. [mailcow](https://privacyratings.com/mail-server-software/mailcow/): B (80/100). Self-hosted mail server suite based on Docker, with SMTP, IMAP, the SOGo webmail and groupware, spam filtering and a web admin interface.
7. [Mailu](https://privacyratings.com/mail-server-software/mailu/): B (80/100). Self-hosted mail server built from Docker containers, with SMTP, IMAP, webmail, spam and virus filtering and a web admin interface.
8. [Mox](https://privacyratings.com/mail-server-software/mox/): B (80/100). Mail server written in Go for low-maintenance self-hosting, combining SMTP, IMAP, webmail, SPF, DKIM, DMARC, MTA-STS, automatic TLS and spam filtering in one program.
9. [Postfix](https://privacyratings.com/mail-server-software/postfix/): B (80/100). Mail transfer agent that routes and delivers email over SMTP, used on many Linux and Unix servers as the default mail server.
10. [Modoboa](https://privacyratings.com/mail-server-software/modoboa/): C (65/100). Self-hosted mail hosting and management platform built on Postfix and Dovecot, with a web admin interface, webmail, calendars, contacts and spam filtering.

Source: https://privacyratings.com/open-source/mail-server-software/