Kalob integrates (web)mail, calendar, todo, filesharing...
In basis it is a combination of well known and solid opensource software, including Postfix, MySQL and Roundcube webmail for example.
Nothing to add, great documentation at https://docs.kolab.org/installation-guide/ubuntu.html
... for a single all-in-one server setup
Scale down (for small environments)
Not really needed, but the number of daemons can be drastically reduced.
in order to support "modern" imap with STARTTLS only.
Restart cyrus with
service cyrus-imapd restart
Trim down the number of apache daemons in
- StartServers 1
- MinSpareServers 2
- MaxSpareServers 3
Restart apache with
service apache2 restart
Scale out to the enterprise!
For SOHO a single server will be sufficient in most cases, but for larger organization you want to have a fully scalable setup. Kolab consists out of about 10 daemons that can all