> > what would it do if it had a TCP-forbidding firewall between it and its
> > RDNS?
> 
> Dunno, but when PowerDNS had TCP bugs in its resolver code, all the
> complaints I got were from Exchange users.

they'll cope.

> What's the rush with deprecating DNS/TCP btw? It languished in the shade for
> 25 years..

that's what we said about udp port randomization after bernstein invented it.

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