[otrs] Ticket lock timeout notification doesn't work!

It's my setting: My queue setting in "Queue Management": - Unlock timeout (minutes) = 20 - Escalation time (minutes) = 20 Setting in preferences: - Ticket lock timeout notification = Yes - my queue is already is already to "custom queue" While i locked a customer's ticket and it's state is changed to open, the system doesn't send any notification email to me. so, what wrong of my setting? Thanks Chris _________________________________________________________ 最新鈴聲推介:十面埋伏，千金，心淡... http://ringtone.yahoo.com.hk