[Unit]
Description=Postfix MTA-STS policy resolver (socketmap)
Documentation=https://github.com/Snawoot/postfix-mta-sts-resolver
After=network-online.target
Wants=network-online.target
Before=postfix.service

[Service]
Type=notify
User=mta-sts
Group=mta-sts
ExecStart=/usr/bin/mta-sts-daemon -c /etc/mta-sts-daemon.yml
Restart=on-failure
TimeoutStopSec=30
StateDirectory=mta-sts
StateDirectoryMode=0750
NoNewPrivileges=yes
ProtectSystem=strict
ProtectHome=yes
PrivateTmp=yes
PrivateDevices=yes
ProtectKernelTunables=yes
ProtectKernelModules=yes
ProtectControlGroups=yes
RestrictAddressFamilies=AF_UNIX AF_INET AF_INET6

[Install]
WantedBy=multi-user.target