It’s not Millennium Edition?

In case people here are not aware, I can create free email address with my domain name for receiving only.

You should be able in gmail, under the Accounts tab in Settings, to add accounts to “Send mail as”. Not sure how much of your problem that solves, though, if any.

It’s a little less terrible if you can use the LTSC IoT version.

Writing an appropriate prompt is a skill. Many (most?) people using LLMs aren’t using prompts that give them what they actually want, in many cases because they don’t understand the thing they’re trying to ask for, but also in many cases because they don’t know how to ask for it while avoiding the many possible pitfalls that come with uncareful prompts (including, but not limited to, hallucination and bias).

Personally I haven’t bothered learning that skill yet, largely because I don’t want that crap shoved in my face all the damned time, and have little use for it anyway. But it’s still a skill.