On 05.10.23 01:37, Viktor Dukhovni via Exim-users wrote:
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.
This sounds very interesting, I'll give it a try! Thanks for the very nice
suggestion!
All the best,
Mario
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