In article <mailman.463.1518283598.749.bind-us...@lists.isc.org> you write: >The target, instead of very quickly rejecting the spam because of the = >lack of a domain or the lack of DNS, instead has to deal with thousands = >of different IPs.
That's not how spam filters work. They do filtering based on the IP address sending the spam and maybe the rDNS. It makes no difference whatsoever if there is some other random A record pointing at the spamming host. You can't even tell. >> Botnets are computers with IP addresses. They don't need DNS pointing = >at them to send spam. > >They do to send spam to any mail admin with even half a brain who would = >not accept unauthenticated mail from an IP without an actual domain = >attached. The half a brain generally requires forward and reverse DNS to match before using them. If you know a way to do fast flux rDNS on botnets, I know a lot of people who'd like to talk to you. R's, John _______________________________________________ Please visit https://lists.isc.org/mailman/listinfo/bind-users to unsubscribe from this list bind-users mailing list bind-users@lists.isc.org https://lists.isc.org/mailman/listinfo/bind-users
