Hello Gerry,
Dr Gerard Bulger:
The DNS 9.9.9.9
https://www.theregister.co.uk/2017/11/20/quad9_secure_private_dns_resolver/
At least is not blocking my exit node IP, simply because it is TOR[sic]! Nice.
please do not use a filtering DNS servers on your exit relay. Apparently they also offer non-filtering DNS servers.
Using filtering DNS servers might gets you the badexit flag https://trac.torproject.org/projects/tor/wiki/doc/ReportingBadRelays