> > 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 less cool than address rewriting and other tricks, though.)
- cks
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