Hello Simon, The server runs local caching DNS BIND, so it's as quick as I can get it on > the slow Internet connection we are on. >
I don't qualify mysef expert enough to answer the rest of your points, but for the DNS part I suggest you think about replacing BIND with Unbound, as the DNS resolver. It has a property called min_ttl that permits you to impose a minimum amount of TTL to the entries reported. DNSBL have always real low TTL values, on purpose. If you are fne with relaxing this real-timeness, well by setting a value of i.e. 60/90 seconds it will permit you to reduce the network dependency. Worth a try. Marco
