[Unit] Description=Postfix sender login socketmap After=mail-transport-agent.target Requires=postfix-sender-login.socket [Service] User=postfix Group=postfix StandardInput=null SyslogFacility=mail ExecStart=/usr/local/bin/postfix-sender-login.pl # Hardening NoNewPrivileges=yes PrivateDevices=yes ProtectHome=yes ProtectSystem=full ReadOnlyDirectories=/ RestrictAddressFamilies=AF_UNIX [Install] WantedBy=multi-user.target Also=postfix-sender-login.socket