zimbra 451 4.3.5 Server configuration problem [solved problem]

You getting this error "zimbra 451 4.3.5 Server configuration problem" in zimbra.log. How to this is solved problem.
You may reading link as below:

zimbra 451 4.3.5 Server configuration problem

The log error as below:
Jan 22 11:31:36 mta postfix/smtpd[9984]: NOQUEUE: reject: RCPT from unknown[]: 451 4.3.5 Server configuration problem; from=<[email protected]> to=<[email protected]> proto=ESMTP helo=<HuuPV>

How I do it....

The first
To increase RAM, CPU for your zimbra system. For example, if your zimbra system  size medium and larger. To increase >= 16GB RAM and >= 8 CPU for zimbra MTA system.
The second
To configure cbpolicyd.conf.in file with parameter min_servers, min_spare_servers, max_spare_servers, max_servers, max_requests the appropriate for your zimbra system configuration.

To openning and configure cbpolicyd.conf.in file
cat /opt/zimbra/conf/cbpolicyd.conf.in
The content to configure as below:


The error "zimbra 451 4.3.5 Server configuration problem" it's solve. You can comment below with zimbra error log


  1. Hello. What will be the setting for mail server with user amount of 1800+?


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