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[Unit]
Description=Postfix Mail Transport Agent
After=network.target

[Service]
Type=forking
ExecStartPre=-/usr/bin/newaliases
ExecStart=/usr/sbin/postfix start
ExecStop=/usr/sbin/postfix stop
ExecReload=/usr/sbin/postfix reload
# Hardening
PrivateTmp=yes
PrivateDevices=yes
ProtectSystem=full
ReadWritePaths=-/etc/mail/aliases.db
CapabilityBoundingSet=~ CAP_NET_ADMIN CAP_SYS_ADMIN CAP_SYS_BOOT CAP_SYS_MODULE
MemoryDenyWriteExecute=true

[Install]
WantedBy=multi-user.target