> So it looks like the issue is my ISP's DNS. But I'm not sure I 
> understand what impact my DNS has on how DNSBL works. 

caching; the DNS caches results; by default such results should
only be cached up to the TTL returned by the auth DNS but some
DNS servers (incorrectly) override that value and this in turn causes
issues like the one you experienced

A suggestion; install your own, local, fully recursive (no forwarders)
DNS server, point your ASSP box to it and forget about such issues



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