SymptomsI configured reminder for the event in Kronolith using Webmail interface, but have not received any notifications.
ResolutionKronolith notifications are sent by 'reminders.php' PHP script that should be run periodically. You can configure it to be run from root crontab for example every 5 minutes. Login to the server as root, run 'crontab -e' and put the line at the end of file:
*/5 * * * * php /usr/share/psa-horde/kronolith/scripts/reminders.php