[otrs] Differentiated auto-replies

Hi, We have and internal OTRS site that most of our customers access. The links to access their tickets only works on our corporate network. A few customers are external to our network. The auto replies going to them also says that they can "click this link to see you ticket". Except, they can't. Is there an easy way to have multiple auto-replies on a queue and select the correct based on e.g. email domain in the customer's ticket? I was thinking of letting postmaster sort the external mails to a different queue with a different auto-reply. That would work, but would give us two queues. -- Lars