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Topic: mail rejected with the log of server configuration error

==== REQUIRED BASIC INFO OF YOUR IREDMAIL SERVER ====
- iRedMail version (check /etc/iredmail-release):  0.9.9
- Deployed with iRedMail Easy or the downloadable installer? downloadable installer
- Linux/BSD distribution name and version:  ubuntu 18.04 LTS
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): LDAP
- Web server (Apache or Nginx):Apache
- Manage mail accounts with iRedAdmin-Pro?
- [IMPORTANT] Related original log or error message is required if you're experiencing an issue.

While sending and receiving mail our ,ail server shows the following postfix error :
Dec  5 12:33:31 dc-extwebsrv-02 postfix/smtpd[117148]: NOQUEUE: reject: RCPT from mail-qt1-f179.google.com[209.85.160.179]: 451 4.3.5 Server configuration problem; from=<shahi.shashi29@gmail.com>.
Please help us solve the issue

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Re: mail rejected with the log of server configuration error

- Is "iredapd" service running?
- Do you run any other Postfix milter program(s)? is it running?