Look under Setup -> Mail Scheduling and Locations -> Locations and uncheck "default account for replying"
Midi John caused electrons to hula in cyberspace with: >First, is there a way to set PM 5.1 up so that when I reply, the "reply >to" address shown for me matches my address that was on the message being >replied to? Right now, no matter which of my addresses a message is sent >to, all replys have the same default address.

