Saturday, January 13, 2024, 12:31:27 AM, Wietse Venema via Postfix-users  wrote:

> Phil Biggs via Postfix-users:
>> postfix/dnsblog 17448 - - warning: dnsblog_query: lookup error for DNS query
>> 137.52.152.104.list.dnswl.org: Host or domain name not found. Name service 
>> error for name=137.52.152.104.list.dnswl.org type=A: Host not found, try 
>> again 
>> 
>> As later lookups returned valid results, I had just put that down to some 
>> glitch with dnswl's servers. 

> Wietse:
>> I suspect packet loss somewhere on the path between your system and
>> list.dnswl.org. I had a few of the above type of error in my maillog
>> files in the months from June to December 2022, for list.dnswl.org
>> and zen.spamhaus.org, and some for both.

> Phil Biggs:
>> It just seemed strange to me that zen disappeared completely from these logs 
>> right after I added dnswl. 

> And does it come back when you remove dnswl? Is this reproducible?
> Is something rate-limiting your DNS? Postfix can't do that.

>         Wietse
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I'll monitor this but it may take a while until one of these logs again.

No rate limiting.  Well, not that I'm aware of.  The Postfix server runs its 
own FreeBSD local-unbound resolver. 

I reversed the order of dnswl and zen to see whether that has any effect.
If it doesn't, I'll take dnswl out and monitor from that point.

Thank you.

-- 
Cheers,
Phil

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