[systemd-devel] exim4 only queues mails sent by systemd service

[Kamil Jońca]

Lennart Poettering <lennart at poettering.net> writes:

> On Mo, 24.09.18 12:04, Mantas Mikulėnas (grawity at gmail.com) wrote:
>
>> > Uh, this looks like something you need to ask the exim community,
>> > systemd can't make exim mail queueing decisions, that's entirely
>> > internal to exim.
>> >
>> > One question though: are you sure you have started the exim service
>> > properly beforehand? I am pretty sure exim won't process the mail
>> > queue if it's not running...
>> 
>> exim's a bit oldschool, and whenever you pipe a message to 'sendmail', it
>> immediately forks a worker to deliver the message synchronously, regardless
>> of the main daemon running.
>
> Uh, what? Are you saying exim is forking off privileged daemon code
> from unprivileged user command invocations? Christ, that's ugly. They
Yes. exim is suid root to deliver mails.

> really really shouldn't do that.

But they do. 

>

> It appears to me exim should figure out some way how clients such as
> 'sendmail' invocations can trigger queue dispatching some other way,
> for example, by making exim listen on some IPC of some form, or using
> inotify or anything else. 
IIRC postfix is written that way, but I want to use exim, as it is more
configurable.
KJ

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