[otrs] Notification problems

Hi I am currently analysing otrs 2.1 with some definite purposes I've noticed that it doesn't send any notification to user accaount when he receives new ticket from the customer. I've checked the checkbox that tells "Send me a notification if there is new ticket in my queues" i have "yes" to there. But it was useless. However it does send a notification about a follow-up What might be the problem. Please help ASAP. Regards Ramziddin