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Topic: spamhaus and b.barracudacentral.org qureies !!

==== REQUIRED BASIC INFO OF YOUR IREDMAIL SERVER ====
- iRedMail version (check /etc/iredmail-release):  1.4.2
- Deployed with iRedMail Easy or the downloadable installer? downloadable installer
- Linux/BSD distribution name and version: ubuntu 20.04
- Store mail accounts in which backend (LDAP/MySQL/PGSQL):  MySQL
- Web server (Apache or Nginx): Nginx
- Manage mail accounts with iRedAdmin-Pro? Yes
- [IMPORTANT] Related original log or error message is required if you're experiencing an issue.
====

I found alot of DNS qureies for spamhaus and b.barracudacentral.org with strange IPs ,, all response is Host not found, try again !! ,, why and how this qureies work and what is correct answer ?!

logs here :
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Mar 28 11:14:48 email postfix/dnsblog[2476903]: warning: dnsblog_query: lookup error for DNS query 21.211.83.41.zen.spamhaus.org: Host or domain name not found. Name service error for name=21.211.83.41.zen.spamhaus.org type=A: Host not found, try again
123664  Mar 28 11:14:50 email postfix/postscreen[374415]: warning: dnsblog reply timeout 10s for zen.spamhaus.org
123674  Mar 28 11:14:50 email postfix/dnsblog[2344285]: warning: dnsblog_query: lookup error for DNS query 250.248.147.66.zen.spamhaus.org: Host or domain name not found. Name service error for name=250.248.147.66.zen.spamhaus.org type=A: Host not found, try again
123679  Mar 28 11:14:51 email postfix/postscreen[374415]: warning: dnsblog reply timeout 10s for zen.spamhaus.org

123822  Mar 28 11:15:04 email postfix/dnsblog[2422599]: warning: dnsblog_query: lookup error for DNS query 46.221.85.209.b.barracudacentral.org: Host or domain name not found. Name service error for name=46.221.85.209.b.barracudacentral.org type=A: Host not found, try again
124882  Mar 28 11:16:56 email postfix/dnsblog[2476693]: warning: dnsblog_query: lookup error for DNS query 46.221.85.209.zen.spamhaus.org: Host or domain name not found. Name service error for name=46.221.85.209.zen.spamhaus.org type=A: Host not found, try again
124883  Mar 28 11:16:56 email postfix/dnsblog[2476694]: warning: dnsblog_query: lookup error for DNS query 46.221.85.209.b.barracudacentral.org: Host or domain name not found. Name service error for name=46.221.85.209.b.barracudacentral.org type=A: Host not found, try again
126947  Mar 28 11:20:20 email postfix/dnsblog[2497978]: warning: dnsblog_query: lookup error for DNS query 46.221.85.209.zen.spamhaus.org: Host or domain name not found. Name service error for name=46.221.85.209.zen.spamhaus.org type=A: Host not found, try again
126952  Mar 28 11:20:20 email postfix/dnsblog[2497976]: warning: dnsblog_query: lookup error for DNS query 46.221.85.209.b.barracudacentral.org: Host or domain name not found. Name service error for name=46.221.85.209.b.barracudacentral.org type=A: Host not found, try again
129211  Mar 28 11:24:06 email postfix/dnsblog[2421530]: warning: dnsblog_query: lookup error for DNS query 46.221.85.209.zen.spamhaus.org: Host or domain name not found. Name service error for name=46.221.85.209.zen.spamhaus.org type=A: Host not found, try again
129212  Mar 28 11:24:06 email postfix/dnsblog[2421532]: warning: dnsblog_query: lookup error for DNS query 46.221.85.209.b.barracudacentral.org: Host or domain name not found. Name service error for name=46.221.85.209.b.barracudacentral.org type=A: Host not found, try again
130729  Mar 28 11:27:09 email postfix/dnsblog[2497976]: warning: dnsblog_query: lookup error for DNS query 46.221.85.209.b.barracudacentral.org: Host or domain name not found. Name service error for name=46.221.85.209.b.barracudacentral.org type=A: Host not found, try again
130733  Mar 28 11:27:09 email postfix/dnsblog[2497978]: warning: dnsblog_query: lookup error for DNS query 46.221.85.209.zen.spamhaus.org: Host or domain name not found. Name service error for name=46.221.85.209.zen.spamhaus.org type=A: Host not found, try again
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Spider Email Archiver: On-Premises, lightweight email archiving software developed by iRedMail team.

2

Re: spamhaus and b.barracudacentral.org qureies !!

- Does your server us a valid DNS server for queries?
- Is your server busy and sent a lot DNS queries? Both spamhaus and b.barracudacentral.org are free if the amount queries are under limited number, but if it beyonds the limited number, you may receive similar message like this.

3

Re: spamhaus and b.barracudacentral.org qureies !!

ZhangHuangbin wrote:

- Does your server us a valid DNS server for queries?

I use 8.8.8.8 as a DNS server .


ZhangHuangbin wrote:

- Is your server busy and sent a lot DNS queries? Both spamhaus and b.barracudacentral.org are free if the amount queries are under limited number, but if it beyonds the limited number, you may receive similar message like this.

I have around 15,000 users , but why iredmail server ask spamhaus and b.barracudacentral.org ?!
In other words ; spamhaus and b.barracudacentral.org use for what ?!


Thanks in advance .
BR

4

Re: spamhaus and b.barracudacentral.org qureies !!

Check its website to understand what they're used for:

https://www.spamhaus.org
https://barracudacentral.org

As mentioned on spamhaus.org website, using a public DNS server may have similar issue since the DNS server may send a lot DNS queries to them. In such case, a self-hosted DNS server (e.g. the DNS server running in your LAN, or a localhost DNS server) will be better.

5

Re: spamhaus and b.barracudacentral.org qureies !!

dont use google DNS for a mailserver, best would be to use your own vps for resolving

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Re: spamhaus and b.barracudacentral.org qureies !!

ZhangHuangbin wrote:

Check its website to understand what they're used for:

https://www.spamhaus.org
https://barracudacentral.org

As mentioned on spamhaus.org website, using a public DNS server may have similar issue since the DNS server may send a lot DNS queries to them. In such case, a self-hosted DNS server (e.g. the DNS server running in your LAN, or a localhost DNS server) will be better.

Cthulhu wrote:

dont use google DNS for a mailserver, best would be to use your own vps for resolving


Thanks Dears , Noted
your efforts are greatly appreciated