lame-servers: SERVFAIL unexpected RCODE resolving

[Alex]

Hi,
Continuing in my quest to figure out why I'm seeing timeout issues from
many of the same nameservers, I'm wondering if someone can help me identify
the reason for these log entries:

26-Nov-2022 09:19:13.969 lame-servers: SERVFAIL unexpected RCODE resolving '
lists.opensuse.org/NS/IN': 195.135.221.195#53
26-Nov-2022 10:02:46.437 lame-servers: SERVFAIL unexpected RCODE resolving '
134.94.245.198.bb.barracudacentral.org/A/IN': 3.13.7.254#53

The vast majority of these types of entries are from the same nameservers
as above. This is a mail server and at least the barracuda entry is a query
to their blocklist service. Are others having problems with this barracuda
service?

I realize generally lame-servers entries can be ignored, but it's a bit
concerning to me, given the large amount of similar entries we're seeing
every day. It also resulted in zero other similar questions when searching
for this error.

Any ideas greatly appreciated.

Thanks,
Alex
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