>I believe that the solution is to have the applications, themselves, >distinguish the cache they are using (or the containing library). A >blocklist app needs to use a different library/cache than a web >browser. You could do it either way. Either you could adjust the MTAs to have a new parameter for the address of the cache to use for DNSBLs vs. the cache to use for MX, A, and AAAA, or you could tell the cache about the list of DNSBLs that the local MTAs use (a list which in my experience is rarely very long.) Pick your poison, depends which software is older and cruddier. Or there's the pessimal approach, add a new EDNS parameter so the MTA can tell the cache what kind of lookup it's making, so you have to upgrade and debug both of them! R's, John _______________________________________________ Ietf mailing list Ietf@xxxxxxxx https://www.ietf.org/mailman/listinfo/ietf