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.

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