Hi Andreas,

exim4-config's accepts mail for system users such as 'daemon' when
local delivery is enabled. I find this unexpected and undesirable:
who's ever going to read these? They just land in /var/mail and aren't
forwarded to root like postmaster et al.

I reproduced this on a fresh bookworm system with
dc_eximconfig_configtype=smarthost, but on my real mailserver I
deliver using dovecot lmtp (a common setup AFAIK), which (temp)rejects
system users due to dovecot's first_valid_uid=1000 default. This
causes (exclusively spam) for system users get stuck in the mailq
which is ugly.

Is this intentional? Do you think it's still useful?

Thanks,
--Daniel

[...]

Hello Daniel,

It has come up before:
file:///usr/share/doc/exim4-base/README.Debian.html
2.7. Handling incoming mail for local accounts with low UID

cu Andreas

Hi Andreas,

Thanks for the quick response and on a Saturday :-)

That's just what I was looking for! Missed it since I was just grepping for
"lowuid".

However I have to admit I see no justification for the default. I'm sure
there are historical reasons I'm not aware of. Was there prior discussion
you're aware of on whether this default still makes sense or do you know of
a use-case that needs this?

Thanks,
--Daniel