Feb 21 19:28:50 localhost postfix[11435]: Starting postfix: [  OK  ]
Feb 21 19:28:50 localhost systemd[1]: PID file /var/spool/postfix/pid/master.pid not readable (yet?) after start.
Feb 21 19:28:51 localhost systemd[1]: postfix.service: main process exited, code=exited, status=1
Feb 21 19:28:51 localhost systemd[1]: Unit postfix.service entered failed state.