On Fri, Feb 17, 2023 at 1:47 PM Murray Crane via BitFolk Users <users@mailman.bitfolk.com> wrote:
Hello all,

Would any of you know if the following scenario is "doable"?

We run an old Exchange 2010 infrastructure at my work, and there is no way they are going to spring for newer: getting them to go from 2003 to 2010 was an ordeal... 

Could I set up an Ubuntu Postfix "relay" server between Exchange and the Internet, that also permits one particular mailbox to be accessible from a Dovecot install on the same server (as well as relaying the mail for that mailbox to Exchange)?

yes, it's all very doable, but if you're going to send emails from the postfix server directly to recipients on the public internet, make sure your sending domain's SPF records include the IP address your postfix server will appear to be sending from once egressing from your network. if you haven't done this already, of course.