WhiteTiger Once you've got all the correct settings in the Admin config of osTicket, you just need to get the cron job to run at a specified interval. Assuming you're using a Linux server of some sort, the easiest way to do this is to run the script as the user the webserver runs as. Assuming this is www-data:
sudo crontab -e -u www-data
Will allow you to edit the crontab for the user (replace www-data with the username your webserver runs as if it's something different). Simply enter the following and save it:
*/2 * * * * php [path to osticket directory]/api/cron.php > /dev/null 2>&1
(replace the first 2 with the frequency in minutes you want email to be polled). If you're using Windows, you'd want to set up a scheduled task to run the same.