On a system with spamassasin, I am seeing Jul 11 11:00:49 foo spamd[494]: plugin: eval failed: available_nameservers: No DNS servers available!
but in fact there is a local dns server (caching resolver) that appears to be entirely ok whenever I query it with dig. looking at a tcpdump of dns traffic, I don't see anything odd, even when looking at an incoming message that threw that error. I see a PTR query for the address and then a few forward queries on the name that's in >From (perhaps helo) and that's it. With no changed software, this feels like the system newly being in a regime of running low on resources, but that doesn't really make sense. This suddenly started happening yesterday. It seems the rate of *.icu spam is huge, and I don't know if something recently about that is newly overwhelming things, or if I had just been blissfully unaware before. I haven't tried to dig into the perl code yet. It would seem best to return 451 when spam filtering has a tempfail. Is anybody else seeing this?
