CRON sends alerts (internal or emails) when an indicator is reached (this means without any user changing the concerned item).
For instance if you have alert on ticket due date, the alert is send when the due date is reached.
This is configured on "Indicators".
But projector also sends alerts on item change : for instance on status change, or when note is added.
This is configured on "Mails on events".
These email don't need the CRON to be sent.
okay. yes that is the actual behavior (which works fine).
but for what i Need cron started
For Alerts on due dates.
For Automatic Import
For Notification system
For import of Replies to email
For Timesheet errors generation
For automatic planning calculation
[Edit] For delayed emails sending