On Friday, 17 February, 2023, Murray wrote
> 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)?

It's not quite the same, but I do and have done
something similar.

Currently, I run postfix and dovecot on a Bitfolk
machine. The postfix daemon is my personal
domain's mail server, storing mail on the VPS
until I collect it from dovecot. My systems are
all Linux, though, not Exchange.

In the past, I set up a postfix system in front of
a charity's Exchange server, handling all incoming
and outgoing mail. Outlook users accessed their
Exchange mailboxes, but the Windows system was
firewalled-off from the Internet. The postfix
system also ran virus and spam filtering.

Unfortunately, that was more than fifteen years
ago, and I've recycled those neurons.

Nick.

--
Nick Chalk ................. once a Radio Designer
 Confidence is failing to understand the problem.

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