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