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On orfeo, Oct 15 07:00:00 (UTC+2), policyd-weight daemon was unable to restart, then all incoming mail were rejected.

# systemctl status policyd-weight.service
● policyd-weight.service - LSB: Start and stop the policyd-weight daemon
   Loaded: loaded (/etc/init.d/policyd-weight; generated; vendor preset: enabled)
   Active: failed (Result: exit-code) since Sun 2017-10-15 07:00:02 CEST; 1 day 5h ago
     Docs: man:systemd-sysv-generator(8)
  Process: 28244 ExecStop=/etc/init.d/policyd-weight stop (code=exited, status=0/SUCCESS)
  Process: 28291 ExecStart=/etc/init.d/policyd-weight start (code=exited, status=1/FAILURE)
    Tasks: 0 (limit: 4915)
   Memory: 372.0K
      CPU: 389ms
   CGroup: /system.slice/policyd-weight.service

# grep "policyd-weight" /var/log/syslog.1 
Oct 15 07:00:00 orfeo systemd[1]: Stopping LSB: Start and stop the policyd-weight daemon...
Oct 15 07:00:02 orfeo policyd-weight[28244]: Stopping policyd-weight (incl. cache): policyd-weight.
Oct 15 07:00:02 orfeo systemd[1]: Stopped LSB: Start and stop the policyd-weight daemon.
Oct 15 07:00:02 orfeo systemd[1]: Starting LSB: Start and stop the policyd-weight daemon...
Oct 15 07:00:03 orfeo policyd-weight[28291]: Starting policyd-weight: policyd-weightmaster: bind 12525: IO::Socket::INET: Address already in use Address already in use at /usr/sbin/policyd-weight line 1052.
Oct 15 07:00:03 orfeo postfix/policyd-weight[28294]: warning: err: init: master: bind 12525: IO::Socket::INET: Address already in use Address already in use at /usr/sbin/policyd-weight line 1052.
Oct 15 07:00:03 orfeo policyd-weight[28291]:  failed!
Oct 15 07:00:04 orfeo systemd[1]: policyd-weight.service: Control process exited, code=exited status=1
Oct 15 07:00:04 orfeo systemd[1]: Failed to start LSB: Start and stop the policyd-weight daemon.
Oct 15 07:00:04 orfeo systemd[1]: policyd-weight.service: Unit entered failed state.
Oct 15 07:00:04 orfeo systemd[1]: policyd-weight.service: Failed with result 'exit-code'.
Oct 15 07:00:05 orfeo postfix/policyd-weight[16253]: cache killed

# /var/log/syslog.1 extract
Oct 15 07:00:39 orfeo postfix/smtpd[28403]: warning: connect to 127.0.0.1:12525: Connection refused
Oct 15 07:00:39 orfeo postfix/smtpd[28403]: warning: problem talking to server 127.0.0.1:12525: Connection refused
Oct 15 07:00:40 orfeo postfix/smtpd[28403]: warning: connect to 127.0.0.1:12525: Connection refused
Oct 15 07:00:40 orfeo postfix/smtpd[28403]: warning: problem talking to server 127.0.0.1:12525: Connection refused
Oct 15 07:00:40 orfeo postfix/smtpd[28403]: NOQUEUE: reject: RCPT from XXX: 451 4.3.5 <XXXX@milkypond.org>: Recipient address rejected: Server configuration problem; from=<XXX@outlook.com> to=<XXX@milkypond.org> proto=ESMTP helo=<XXX>

Thanks to rtp for pointing that.