Thank you so much for the reply ! This is my current setup for email fetching .

As for the second link, id like to clarify whether i need to setup the cron first ? After that do i need to enable 'Fetch on auto cron here as well?

Lastly, id like to ask how does the EXTERNAL TRIGGERING USING WGET works ? I have checked the old setup of our OsTicket before (which the autocreation of ticket from email works) but there is no cron enabled from the system . Athough there are API keys listed but all their status are disabled . I couldnt as the person who set it up before since he's no longer in our company .
I'd really appreciate it if you could enlighten me a bit more about this . Thank you so much for the time.