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

[Mantas Mikulėnas]

On Mon, Sep 24, 2018 at 7:51 PM Mantas Mikulėnas <grawity at gmail.com> wrote:

>
>
> On Mon, Sep 24, 2018, 16:29 Kamil Jońca <kjonca at o2.pl> wrote:
>
>> 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
>>
>
> When I was writing exim systemd units for Arch a few years ago, I
> experimented with using queue_only=true and no permanent daemon at all, but
> triggering the queue runner via systemd.path units (start as soon as spool
> is non-empty) and timers (to replace the usual -q15m).
>
> .path units are inotify-based and can start exim as soon as
> /usr/bin/sendmail puts something in the queue.
>
> This didn't work well enough IIRC, but if it did, then it'd provide almost
> postfix-like architecture.
>

Or just making 'sendmail' send a SIGALRM to the main daemon would do the
job perfectly well, I suspect...

-- 
Mantas Mikulėnas
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