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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