+d=/etc/systemd/system/radicale.service.d
+mkdir -p $d
+sudo dd of=$d/override.conf <<'EOF'
+[Unit]
+# this unit is configured to start and stop whenever openvpn-client@mail.service
+# does
+After=network.target
+BindsTo=openvpn-client@mail.service
+After=openvpn-client@mail.service
+
+[Install]
+RequiredBy=openvpn-client@mail.service
+EOF