So from the headers, it looks like you are using a dynamic value for the from address, is that correct? that is probably the cause.
In the Universal Email wizard, click the From Button next to the From insert to access the Advanced From page.Screen shot 2013-04-18 at 11.32.25 AM.jpgon this page you can enter the reply to addressScreen shot 2013-04-18 at 11.33.09 AM.jpg