On 05.10.23 01:59, Chris Siebenmann via Exim-users wrote:
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.
Another, much more brute force way (if you don't have a common
/etc/passwd file that's somehow distributed around) is to change the
/etc/passwd GECOS field for relevant accounts to have the machine's name
in it. This assumes you have a limited number of such accounts and that
your machine names are fixed (you don't rename them around), but it's
very light-weight and easy.
We do this (for root) with:
chfn -f "$(hostname) root" root
It wouldn't be hard to do this for a list of system logins, especially
if you didn't care greatly about duplicating their current GECOS values.
This has been quite handy to tell at a glance what important system is
sending us root email for some reason, without having to look at the
Received: headers or hope that whatever generated the email put the
hostname in the Subject:.
This is actually also a pretty nice idea, I will also test that. We have
quite a limited number of users so it should not be too hard to test.
Thanks for the suggestion!
All the best,
Mario
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