@acf we use https://letsjelly.com/ for the in-house ask-a-developer helpdesk. It works.
Jelly: Simpler email collaboration for small teams

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Jelly
@gavin @acf I don't use Jelly but I've heard good things about the people behind it: https://goodenough.us/
Good Enough

Hello, we are Good Enough. We make useful, well-made software, like Pika, Letterbird, and Album Whale. You’re good enough, too.

Good Enough