Hi M.
You can receive mail in your exchange server for any email address you can
control the MX records, either by POP or SMTP. Once the MX point to the
server, you need to supply a user with that email address.
In ADUC, find the user, rclick, properties, exchange address tab, add the
address in question, smtp. Exchange will receive the mail, find that address,
and stick the incoming into that mail box. The "default" address, the one
in bold, is the "reply to" address, and you can change it there. If you
do, untick the box to use the default policy or it will snap back.
If you need to be able to choose the reply address depending on what message
is being replied to, search the web for things like multiple reply addresses
or post back here.
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