/lib/systemd/system/courier.service is in courier-mta 0.76.3-5+deb9u1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 | [Unit]
Description=Courier Daemon
Requires=courier-authdaemon.service
After=courier-authdaemon.service
PartOf=courier-mta.service
[Service]
Type=forking
ExecStart=/usr/sbin/courier start
ExecStop=/usr/sbin/courier stop
[Install]
WantedBy=multi-user.target
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