[CentOS] Postgrey not working

Hi,

I have a working installation of Postfix and Dovecot that works nicely.
I've added SpamAssassin, which does a good job of flagging spam. Now I
wanted to add greylisting to my server.

Here's what I did.

$ sudo yum install postgrey

Increase the greylisting delay.

# /etc/sysconfig/postgrey
POSTGREY_OPTS="--delay=300"

Edit /etc/postfix/main.cf accordingly.

smtpd_recipient_restrictions =
  permit_mynetworks,
  permit_auth_destination,
  permit_sasl_authenticated,
  check_policy_service unix:/var/spool/postfix/postgrey/socket,
  reject

Start/restart services.

$ sudo systemctl enable postgrey
$ sudo systemctl start postgrey
$ sudo systemctl restart postfix

Now Postgrey seems to be running OK.

$ systemctl status postgrey
● postgrey.service - Postfix Greylisting Service
   Loaded: loaded (/usr/lib/systemd/system/postgrey.service; enabled;
vendor preset: disabled)
   Active: active (running) since mer. 2019-06-19 09:39:04 CEST; 19min ago
     Docs: man:postgrey(8)
  Process: 5228 ExecStart=/usr/sbin/postgrey
--unix=/var/spool/postfix/postgrey/socket
--pidfile=/var/run/postgrey.pid --group=postgrey --user=postgrey
--greylist-text=Greylisted for %%s seconds --daemonize $POSTGREY_OPTS
(code=exited, status=0/SUCCESS)
  Process: 5225 ExecStartPre=/bin/rm -f /var/run/postgrey.pid
(code=exited, status=0/SUCCESS)
 Main PID: 5229 (/usr/sbin/postg)
   CGroup: /system.slice/postgrey.service
           └─5229 /usr/sbin/postgrey
--unix=/var/spool/postfix/postgrey/socket --pidfile=/var/run/p...

juin 19 09:39:03 sd-100246 systemd[1]: Starting Postfix Greylisting
Service...
juin 19 09:39:04 sd-100246 postgrey[5229]: Process Backgrounded
juin 19 09:39:04 sd-100246 postgrey[5229]: 2019/06/19-09:39:04 postgrey
(type Net::Server::Multi...29)
juin 19 09:39:04 sd-100246 postgrey[5229]: Binding to UNIX socket file
"/var/spool/postfix/postg...et"
juin 19 09:39:04 sd-100246 postgrey[5229]: Setting gid to "238 238"
juin 19 09:39:04 sd-100246 systemd[1]: Started Postfix Greylisting Service.
juin 19 09:39:04 sd-100246 postgrey[5229]: Setting uid to "994"

The only problem is that there's no greylisting. I tried to send mails
from various mail servers to this machine. Everything gets delivered
immediately, and there's no greylisting action in /var/log/maillog.

Any suggestions?

Niki
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