On Mon, Mar 02, 2015 at 08:56:29PM -0600, helices wrote: > For each incoming message received, every outgoing "reply" must use the > "To:" address from the incoming received message as the "From:" address in > the outgoing reply.
I see you're also asking the same question on the exim-users list. And the answer there is essentially the same, it is likely possible to kludge something together at the MTA layer (in the case of Postfix via a suitable content-filter or milter that tags inbound mail in such a way that replies can be identified and rewriten in outbound mail), but regardless of which MTA you use, such a design is fragile and ugly. This really is a job for the MUA. And IIRC that Outlook/Exchange already support the requisite feature. -- Viktor.