Do not post your messages in a thread that's not on the same topic, I've moved this to a new thread. What you haven't done is provide any information of your POSTGREY configuration nor which version of ZCS is being used as shown by the output of the following command (you should always post this):
Release 8.8.12_GA_3794.RHEL7_64_20190329045002 RHEL7_64 FOSS edition, Patch 8.8.12_P6.
for installation I use this
To figure out the port on your system run postgrey and see parameters:
# /etc/init.d/postgrey start
Starting postfix greylisting daemon: postgrey.
# ps ax | grep postgrey
27422 ? Ss 0:00 /usr/sbin/postgrey --pidfile=/var/run/postgrey.pid --daemonize --inet=10023
Configuring the Zimbra Postfix:
sudo vi /opt/zimbra/conf/postfix_recipient_restrictions.cf
...and add the following above any lines started with '%%'(Consider your port number). The final line should contain only 'permit':
...then restart (as the user zimbra) Postfix (which will re-create /opt/zimbra/postfix/main.cf)
$ postfix reload
Notes: See the stuff that get's added to smtpd_recipient_restrictions?
Changing the delay
-The default is 5/10 minutes depending on where you get your download so if you wanted it 10 minutes: /etc/default/postgrey Depending on your version/if you download the package and manually edit before you install: