Phil Biggs via Postfix-users:
>
> Back in June of 2023 I added list.dnswl.org to postscreen.
>
> Over time I've noticed that I get the occasional lookup error like this:
>
> 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.
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.
Wietse
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