Timo Geusch:
> Based on zen.spamhaus.org's documentation 127.255.255.25[245] are 
> actually error codes and not indicators of allow/denylisting - in this 
> case, their error is that I was querying via a public resolver, see link 
> here: https://www.spamhaus.org/faq/section/DNSBL%20Usage#200

So don't do that.

> The fix/workaround in my case is relatively easy as I mostly need to 
> update the configuration for my local DNS server. That said, I'm not 
> sure if postscreen should treat this kind of error as a denylisted server?

postscreen has no provider-specific parsing of DNSBL status codes.

Instead, postscreen assumes that all replies are true positives.
To select specific responses, see the fine postscreen_dnsbl_sites
documentation.

        Wietse

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