Freedom251 › Mail Server Software
Kolab
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| Kolab | Open-source product · self-hosted | Free |
As kolab.org lists them, read 9 Oct 2026. The maker's own page has the final word.
Facts from Kolab's own pages
- Calendar and tasks
- Kolab supports shared, colour-coded calendars, recurring events, time-zone support, invitation handling, to-do lists and task assignment. · kolab.org, 9 Oct 2026
- Collaboration
- Kolab provides shared email folders, calendars and task lists with granular access control, video conferencing and collaborative document editing. · kolab.org, 9 Oct 2026
- Compliance and backup
- The feature page describes Kolab as GDPR, HIPPA and PCI compliant and lists on-premise deployment and data backup. · kolab.org, 9 Oct 2026
- Deployment
- Kolab is packaged as containers that can run on one host or be distributed across a larger environment. · kolab.org, 9 Oct 2026
- Deployment requirement
- The quickstart says a publicly available non-clustered deployment requires one public IP and warns that email sending and receiving and WebRTC will not work without one. · docs.kolab.org, 9 Oct 2026
- Email features include full-text search, filtering, aliases, identities, distribution lists, spam protection and PGP encryption. · kolab.org, 9 Oct 2026
- Intended users
- Kolab describes itself as a solution for companies and families that need to work and communicate together while retaining control over their data. · kolab.org, 9 Oct 2026
- Maker
- The site identifies Apheleia IT AG as the organization behind Kolab. · kolab.org, 9 Oct 2026
- Paid services
- Apheleia IT offers professional services subscriptions for larger organizations, including consulting, infrastructure integration, customization, migration, white labeling and training. · kolab.org, 9 Oct 2026
- PGP caveat
- Kolab's PGP feature article says the web client can store copies of public and private keys on the server and says true end-to-end encryption requires client encryption. · kolab.org, 9 Oct 2026
- Product
- Kolab is a free and open-source communication and collaboration solution that can be run on your own infrastructure. · kolab.org, 9 Oct 2026
- Protocols
- Kolab supports ActiveSync, IMAP, SMTP, CalDAV and CardDAV for synchronizing email, calendars and tasks. · kolab.org, 9 Oct 2026
- Security
- The feature page lists PGP, two-factor authentication, DKIM/DMARC and spam protection among its email security features. · kolab.org, 9 Oct 2026
- Third-party clients
- The feature page names Thunderbird, Outlook, eM Client, Apple Mail and Apple Calendar as supported third-party clients. · kolab.org, 9 Oct 2026
Where Kolab stands on Freedom251
- Mail Server Software#7 of 34