On Mon, 05 Nov 2018 12:14:50 -0500 Bill Cole wrote: . I would guess that with some authoritative > servers refusing to serve invalid names and some resolvers refusing > to resolve them, it would be a low-yield tactic to use them to evade > filtering.
Authoritative nameservers are potentially under the control of spammers. As regards resolvers, it works on Free/NetBSD, Windows and Android. If it works on FreeBSD and Android, it probably works on IOS, OS X and Linux too.