# /usr/lib/systemd/user/fetchmail.service
# or any other location per man:systemd.unit(5)
[Unit]
Description=Fetchmail Daemon
Documentation=man:fetchmail(1)

[Service]
ExecStart=fetchmail --nodetach --daemon 300
ExecStop=fetchmail --quit
Restart=always

[Install]
WantedBy=default.target