[otrs] Use Reply-To Variable in Postmaster Filter

I am trying to create a Postmaster Filter using the web UI to take an email and take the Reply-To address and make that the ticket owner (X-OTRS-CustomerNo) and email used for all future communication. I am having a problem on the 'Set' section for X-OTRS-CustomerNo. How do I have it read the value of Reply-To and use that value? Brian McFarlane Director of Information Technology College of Law at Arizona State University http://www.law.asu.edu/ Phone : 480-965-7573 Fax : 480-965-4283 Email : brian.m@asu.edu