[Unit] Description=Postfix postlift helper Documentation=man:postlift(8) Requires=postlift.socket [Service] # DO NOT run as "postfix" (i.e. core daemon privilege). User=postdrop Group=postdrop ExecStart=/usr/libexec/postfix/postlift Type=simple StandardInput=socket StandardOutput=socket # Only stderr goes to journal for logging StandardError=journal SyslogFacility=mail