cyrusimap/cyrus-imapd

All-in-one Mail & Collaboration server. Secure, scalable and fluent in every protocol (IMAP, JMAP, SMTP, CalDAV, CardDAV, WebDAV).

Baïkal is a Calendar+Contacts server

A simple CalDAV (calendar) and CardDAV (contact) server.

🗓 A modern, simple, feature-packed, fully translatable admin interface for sabre/dav based on Symfony 7 and Bootstrap

Kurrier is a modern, self-hosted workspace for email, calendar, contacts and storage.

SOGo is a very fast and scalable modern collaboration suite (groupware). It offers calendaring, address book management, and a full-featured Webmail client along with resource sharing and permission handling. It also makes use of documented standards (IMAP, CalDAV, CardDAV, etc.) and thereby provides native connectivity (without plugins) to many clients such as Microsoft Outlook, Apple iCal, the iPhone, Mozilla Lightning, and a plethora of mobile devices.

Opinionated email server

Mail hosting made simple

Provides a ready-to-go Baikal server, incl. docker-compose.yml & Systemd service file