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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---
Description="Test maili"
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.

Better hope the life-inspector doesn't come around while you have your
life in such a mess.