Let each spam come from a different IP.
client ip factored query block query
--------- -------------------------- ---------------
192.0.2.1 lookup(aol.com, 192.0.2.1) lookup(aol.com)
192.0.2.2 lookup(aol.com, 192.0.2.2) cached
192.0.2.3 lookup(aol.com, 192.0.2.3) cached
192.0.2.4 lookup(aol.com, 192.0.2.4) cached
192.0.2.5 lookup(aol.com, 192.0.2.5) cached
I still don't see how it's different.
In draft-ietf-marid-core, the first of the above will do a TXT query
on _ep.aol.com and aol.com. Each of the subsequent lookups will use
the positively or negatively cached results.
In draft-ietf-marid-csv-csa, the first of the above will do a SRV
query on _client._smtp.aol.com. Each of the subsequent lookups will
use the positively or negatively cached results.
-roy