Same here. I have several domains, one is used for servers and email, 2nd for websites, 3rd for messing around (test setups) and a 4th is almost unused now, but with the demise of twitter and reddit I’m thinking of using that one for the fediverse (it’s my username in national tld).

BTW internal and external dns run on different systems and all private zones are dnssec signed. (Loved the challenge on setting that up correctly)