On Wed, Oct 04, 2023 at 09:36:12PM +0200, Mario Emmenlauer wrote:
> > Rather than leak user@<somehost>.domain forms out to the public
> > Internet, explain and solve the real problem that not masquerading
> > all users behind the primary domain is supposed to solve???
>
> So for me, the exim email system on the desktop computers is exclusively used
> by the Linux operating system. I do not enable incoming email, so all mails
> are
> generated by the various services that come with Linux. Some of these services
> are operated intentionally by me, like logcheck and monit. But some are just
> basic system services that tend to report relevant information via email,
> often
> to root.
As I suspected, you're sensibly trying to be able to tell at a glance
which machine a message is from. This use-case is the main purpose of
the address rewritng proposed in the Postfix null-client guide in the
MULTI_INSTANCE doc.
I am sure confident very similar can be done in Exim. Just rewrite
on each host (From headers):
# Replace "admin" with any suitable name of your choice.
# Replace "hostname" with the actual name of each machine.
root -> admin+root=hostname@domain.example
bin -> admin+bin=hostname@domain.example
...
Any bounces will end up in "admin"'s mailbox on the smarthost.
You'll be able to tell where the message came from by looking
at the From address.
--
Viktor.
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