Open-source Email Servers software
Mail servers and webmail you run yourself
- Stalwart Mail ServerAlternative to Google Workspace, Microsoft 365
An all-in-one mail and collaboration server written in Rust, with JMAP, IMAP, POP3, SMTP, CalDAV, CardDAV and WebDAV, offered in a free Community edition and a paid Enterprise edition.
AGPL-3.0Self-hosted15kGitHub starsSome features paywalled - mailcowAlternative to Google Workspace, Microsoft 365
A Docker-based mail server suite that bundles Postfix, Dovecot, Rspamd, SOGo webmail and a web admin interface.
GPL-3.0Self-hostedCloud14kGitHub starsNot yet assessed - RoundcubeAlternative to Gmail
A browser-based, multilingual IMAP webmail client written in PHP that you host in front of your own mail server.
GPL-3.0-or-laterSelf-hosted7.2kGitHub starsNot yet assessed
