[otrs] Problem with EMail notification !

Hello, I have some trouble whit EMail Notification. I ha ve configured a POP3 account. If i send a message to this POP3 account, le message is sent in the good queue and i my agents receive an email. If a customer create a new ticket, my agents don't receive notification mail ! if an agent edit on close the ticket, my customer receive an email. My only question is why my agents don't receive an email if the ticket is created in the web interface ?? thank's a lot. -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.1.409 / Virus Database: 268.15.3/561 - Release Date: 01/12/2006