[otrs] attachments in closed tickets..

Hi again, When i close a ticket , i add an attachment to the customer. The customer can not receive it in e-mail. The e-mail goes without the attachment. But it works when a customer opens a ticket with an attachment the agent can receive tha attachment within e-mail as well. So it should be possible. Does anyone has an idea from the mailing group or from otrs developers.. Should i give up trying? Please someone answer :) Sarper