[otrs] reply-to field in notification mails

Hi all, I've been searching for solution for a day now, in archive and forums, but I couldn't find a method to set the notification mail's "Reply-To" field. We're using OTRS 3.0.6, the specific use case is that we send notification emails to customers (through SMTP) about almost everything, from the address otrs@companyname.com, but in case the customer replies, we'd like those mails to arrive in support@companyname.com. Can somebody help me, how is that possible? Thanks, Viktor