Because Citadels is open-source software under the GNU General Public License (GPL), it is .
Citadels is a robust groupware system written in C, making it incredibly lean and memory-safe. It isn't just an email server; it’s a comprehensive collaboration suite that includes: Citadels Free Download
For those who want to get up and running quickly, Citadels offers an "Easy Install" script. You can run a single command in your terminal to download, compile, and configure the entire system automatically. Because Citadels is open-source software under the GNU
Manage your inbox and schedules with ease. Discussion Forums: Host private or public community spaces. You can run a single command in your
Sync your calendars and contacts directly to your smartphone. Final Thoughts
The primary web-based interface that works in any browser.
Tip: Always check the official documentation for the current Easy Install command.