Audience
Businesses needing a powerful Mail Server solution
About Citadel
Email, collaboration, groupware, and content management - up and running in minutes, on your own hardware, or in the cloud. Citadel is easy, versatile, and powerful, thanks to its exclusive room-based architecture. No other platform seamlessly combines so many different features using this familiar and consistent metaphor. Citadel is 100% open source software using the GNU General Public License. It's not a crippled, cut-down version of some expensive "enterprise" edition. The software you download here is the very best available, and it's all free software.
Other Popular Alternatives & Related Software
Kopano
We provide you with your digitally sovereign solution to keep track of your e-mails and calendars, to organize yourself with tasks or to stay in contact with team colleagues via video meeting. Kopano Groupware is an e-mail and calendaring solution, which can be operated digitally sovereign. Its functionality is comparable to that of Microsoft Outlook and Exchange. Kopano Groupware installations can be operated with more than 100,000 users. Kopano Groupware is an e-mail and calendar server that provides users with their daily communication and organizational data on all devices and connects teams. Data can be jointly edited in public folders or shared with others from your own inbox.
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Citadel Team
As easy to use as your personal communication apps, Citadel Team is compatible on all your terminals and offers all the standard features of instant communication. Operated by Thales and hosted in France, Citadel Team offers a high level of security and guarantees a model without data resell. Activated when necessary, with the end-to-end encryption option, only your devices can read your conversations. Deploy, control and manage your corporate fleet from the Citadel Team administration console, while guaranteeing the identity of your users via their professional e-mail. Increased team reactivity, centralized conversations and file sharing in private or public personalized spaces for your projects. Boost communication by inviting thousands of members in dedicated chat rooms! Citadel Team also allows you to discuss privately with each of your internal collaborators and invite external partners.
Learn more about Citadel Team
Courier
The Courier mail transfer agent (MTA) is an integrated mail/groupware server based on open commodity protocols, such as ESMTP, IMAP, POP3, LDAP, SSL, and HTTP. Courier provides ESMTP, IMAP, POP3, webmail, and mailing list services within a single, consistent, framework. Individual components can be enabled or disabled at will. The Courier mail server now implements basic web-based calendaring and scheduling services integrated in the webmail module. Advanced groupware calendaring services will follow soon.
The Courier mail server's source code should compile on most POSIX-based operating systems based on Linux, and BSD-derived kernels. The Courier mail server should also compile on Solaris and AIX, with some help from Sun's or IBM's freeware add-on tools for their respective operating systems.
The Courier mail server evolved out of several related projects, that merged together (more on that later). The Courier mail server implements SMTP extensions for mailing list management.
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Call Citadel
Call Citadel helps small plumbing and HVAC businesses follow up when a customer call goes unanswered. After setup, unanswered calls are forwarded from the business's existing number. Call Citadel starts a text conversation with the caller, gathers the service need, location and urgency, and sends the details to the business owner for a callback. The owner decides how to respond and arrange the work. Customers keep calling the business number they already know. Setup includes carrier registration and approval, which usually takes two to three weeks and can take longer. The free trial lasts 30 days from verified go-live. No credit card is required to start. Service costs 497 US dollars per month after the trial if the business chooses to continue.
Learn more about Call Citadel
Pricing
Starting Price:
Free
Free Version:
Free Version available.
Integrations
Company Information
Citadel
www.citadel.org
Videos and Screen Captures
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Product Details
Platforms Supported
Linux
Training
Documentation
Support
Online
Citadel Frequently Asked Questions
Q: What kinds of users and organization types does Citadel work with?
Citadel works with these users and organization types: Mid Size Business, Small Business, Enterprise, Freelance, Nonprofit, Government, and Startup.
Q: What languages does Citadel support in their product?
Citadel supports these languages: English.
Q: What kind of support options does Citadel offer?
Citadel offers support via online.
Q: What other applications or services does Citadel integrate with?
Citadel integrates with: Docker, Muraena, and Ubuntu.
Q: What type of training does Citadel provide?
Citadel provides training in the form of documentation.
Q: How much does Citadel cost?
Pricing for Citadel starts at Free.
