[otrs] Why the incoming email not post in raw queue?

i have just created a otrs system and i've created a mail aliase for the system by add the fllowing line to /etc/aliases helpdesk:otrs but while the user send email to helpdesk@mydomain, the mail would become a new ticket, but it posted into some other queue rather than "raw" queue. so how can i configure it to post all incoming email to raw queue? Thank you very much Chris. 最新鈴聲推介:十面埋伏，千金，七友... http://ringtone.yahoo.com.hk