[otrs] Need to adjust cron job in order to fetch mail quicker?

Like the subject says, tickets sometimes dont come in when sending email in a timely fashion (sometimes i have to go to the admin postmastermailaccounts panel and click fetch mail. I searched this and found: * Martignier, Philippe :

Hi there,

I want to speed up the frequence of refresh (= an email arrives in Outlook and then OTRS looks in the mail box if there is a mail it deletes that email and create a ticket inside OTRS)

...

Well, don't use fetchmail, but feed OTRS directly via SMTP.

I don't understand how to feed OTRS directly with SMTP. I look in the email accounts panel of otrs and the only options i see are imap, imaps, pop and pops. Can someone tell me how to accomplish getting emails sent to otrs quicker?