[otrs] OTRS is not using the secone email address as FROM: on reply

Hi, in our OTRS setup we have two incoming emailboxes (A and B) where the mails are fetched from and queued in properly. A is queued into A-queue and B into B-queue, but if we are replying to a ticket in both cases the email address A is used in the FROM: field. The question is, is it and how is it possible to use email address A as FROM: reply field for queue A and email address B as FROM: reply field for queue B ?!? Thank you, Sven