==== REQUIRED BASIC INFO OF YOUR IREDMAIL SERVER ====
- iRedMail version (check /etc/iredmail-release): 0.9.9
- Deployed with iRedMail Easy or the downloadable installer? Downloaded
- Linux/BSD distribution name and version: ubuntu 18.04.1
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): PGSQL
- Web server (Apache or Nginx): NGINX
- Manage mail accounts with iRedAdmin-Pro? No
- [IMPORTANT] Related original log or error message is required if you're experiencing an issue.
====

Hi again, i was just checking syslog and realised an error

Feb  9 21:20:47 mail postfix/dnsblog[5398]: warning: dnsblog_query: lookup error                                                                                                          for DNS query 175.166.85.209.zen.spamhaus.org: Host or domain name not found.                                                                                                         Name service error for name=175.166.85.209.zen.spamhaus.org type=A: Host not found                                                                                                  ,try again

Can someone pls enligten me about this error and corrective action? Thank you