On Mon, 02 Mar 2015 20:56:22 -0600, helices wrote:
> I am tasked to design, build and maintain a new MTA.  The company has 
> one special requirement, for which I'm investigating the simplest solution:
>
> 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.
>
> This is trivial when the incoming has "To: [email protected]," Sally 
> reads and replies, and the outgoing message has "From: [email protected]"
>
> It's trickier when the incoming has "To: [email protected]," the MTA 
> delivers to an Exchange server, which distributes that message to Sally, 
> and Sally replies.  What is the simplest way for that outgoing message 
> to use "From: [email protected]?"

Probably add/rewrite the Reply-To header of the incoming message,
encoding the To address in the new Reply-To header together with the
Reply-To/From address, and then rewrite the From/To headers again on
outgoing messages.


Christof

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