For a long time now, I have in my postfix logs the following messages:
warning: dnsblog_query: lookup error for DNS query 18.104.22.168.zen.spamhaus.org: Host or domain name not found. Name service error for name=22.214.171.124.zen.spamhaus.org type=A: Host not found, try again
warning: dnsblog reply timeout 10s for zen.spamhaus.org
These messages exists for both IPv4 addresses, as well as for IPv6 ones. I always thought it was normal and ignored the message but then I saw in the github repo that this is not supposed to be as it is. In fact, I cannot remember if it has ever worked.
The issue is strange. These are the tests I’ve run on the same machine:
dig 126.96.36.199.zen.spamhaus.org gives me a response, while
docker-compose exec acme-mailcow dig 188.8.131.52.zen.spamhaus.org @unbound times out.
docker-compose exec acme-mailcow dig google.com @unbound gives a response.
The server is based on debian (latest stable) and is running only mailcow (currently on 79f8a3c) as well as fail2ban (for the ssh access). Iptables has not been manually adapted.
git diff origin/master only yields one change in /data/conf/postfix/main.cf (myhostname) (I don’t remember why I changed that but this should not be the issue).
Is anyone having similar issues or knows what that could be?