[otrs] The creation of tickets

Hi there We've been using RT for a while now and are now in the process of converting to OTRS. One of the features of RT was that you could create new tickets and avoid them getting sent to the customer upon creation. Problem with OTRS is that if you set up a auto response that's supposed to give the user feedback that their ticket has been accepted to the system, this will also happen for tickets created "internally" by the agent. Is it possible to set up auto response so that it only happens when receiving external emails? Marius