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[Unit] Description=MTA STS resolver daemon After=network.target remote-fs.target nss-lookup.target [Service] Type=simple User=mta-sts ExecStart=/usr/bin/mta-sts-daemon Restart=always PrivateTmp=true PrivateDevices=true ProtectSystem=strict ProtectHome=true ProtectKernelTunables=true ProtectControlGroups=true NoNewPrivileges=true [Install] WantedBy=multi-user.target