name : postfix-mta-sts-resolver.service [Unit] Description=Provide MTA-STS policy map to Postfix Documentation=man:mta-sts-daemon(1) man:mta-sts-daemon.yml(5) After=redis-server.service Before=postfix.service [Service] Type=notify ExecStart=/usr/bin/mta-sts-daemon --config /etc/mta-sts-daemon.yml Restart=on-failure User=_mta-sts Group=_mta-sts AmbientCapabilities= CapabilityBoundingSet= DevicePolicy=closed LockPersonality=yes MemoryDenyWriteExecute=yes NoNewPrivileges=yes PrivateDevices=yes PrivateTmp=yes ProtectControlGroups=yes ProtectHome=yes ProtectKernelModules=yes ProtectKernelTunables=yes ProtectSystem=strict # sqlite ReadWritePaths=/var/lib/mta-sts/ -/var/spool/postfix/run/mta-sts RemoveIPC=yes # AF_UNIX needed for sd_notify RestrictAddressFamilies=AF_INET AF_INET6 AF_UNIX RestrictNamespaces=yes RestrictRealtime=yes SystemCallArchitectures=native SystemCallFilter=@basic-io @default @file-system @io-event @ipc @network-io @process @signal @system-service UMask=0022 [Install] WantedBy=multi-user.target