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exim4 only queues mails sent by systemd service

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  exim4 only queues mails sent by systemd service kjonca@poczta.onet.pl (Kamil Jońca) - 2018-09-23 13:10 +0200
    Re: exim4 only queues mails sent by systemd service kjonca@poczta.onet.pl (Kamil Jońca) - 2018-10-03 09:10 +0200
      Re: exim4 only queues mails sent by systemd service <tomas@tuxteam.de> - 2018-10-03 10:00 +0200

#200474 — exim4 only queues mails sent by systemd service

It is something strange with sending mails from systemd system service:
assume we have service file /etc/systemd/system/mailtest.service:

--8<---------------cut here---------------start------------->8---
[Unit]
Description="Test maili"
[Service]
#User=kjonca
NoNewPrivileges=false
Type=oneshot
ExecStart=-zsh -c 'echo xxx|mail news'
ExecStart=-zsh -c 'echo xxx|mutt -F /dev/null -s subject -e \'set copy=no\' kjonca'
--8<---------------cut here---------------end--------------->8---

When i call
sudo systemctl start mailtest.service
Two messages are put in exim queue, but not deliveried immediately.
Why? What am I missing?
Morevoer this service run as "--user" service works as expected - mails
are delivered at once.
KJ

-- 
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life in such a mess.

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#200841

kjonca@poczta.onet.pl (Kamil Jońca) writes:

> It is something strange with sending mails from systemd system service:
> assume we have service file /etc/systemd/system/mailtest.service:
>

After discussion on systemd list, it turned out that we have race
condition here.

1. exim forks and creates background process to deliver mail
2. systemd, after main process exits, kill all remaining proceses, so
...
3. background process are killed during delivery, and message remains in
queue.

I think this is important for services sending mails (for example
logrotate with mail option)

There are two solutions/workarounds:
1. migrate to postfix :)
2. set KillMode=none in service file.
KJ

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		-- Douglas Coupland, "Generation X: Tales for an Accelerated
		   Culture"

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#200842

[Multipart message — attachments visible in raw view] — view raw

On Wed, Oct 03, 2018 at 08:48:51AM +0200, Kamil Jońca wrote:
> kjonca@poczta.onet.pl (Kamil Jońca) writes:
> 
> > It is something strange with sending mails from systemd system service:
> > assume we have service file /etc/systemd/system/mailtest.service:
> >
> 
> After discussion on systemd list, it turned out that we have race
> condition here.
> 
> 1. exim forks and creates background process to deliver mail
> 2. systemd, after main process exits, kill all remaining proceses, so
> ...
> 3. background process are killed during delivery, and message remains in
> queue.
> 
> I think this is important for services sending mails (for example
> logrotate with mail option)
> 
> There are two solutions/workarounds:
> 1. migrate to postfix :)
> 2. set KillMode=none in service file.

3. use another init.

Cheers
-- t

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