Comment # 2 on bug 932163 from Marcel Pennewi�

I can confirm this annoying issue.
Workaround: Create File /etc/systemd/system/fetchmail.service with

.include /usr/lib/systemd/system/fetchmail.service

[Service]
ExecStart=
ExecStart=/usr/bin/fetchmail -d 600 -f /etc/fetchmailrc

and run "systemctl daemon-reload" afterwards.