The worry most people have about AI writing their messages is simple: what if it sends something I wouldn't have said?
One sensible answer is to make trust something you set per person, not a global switch. The Grais extension works that way. Every new contact starts at "review every draft," so nothing goes out until you've read it. For people you talk to all the time, you can move up a step and approve by voice, or let it handle that conversation on its own. You can move anyone back down whenever you like.
It runs as an overlay in Chrome, Brave, Edge and Arc on desktop, on top of the chat apps you already have open, rather than connecting to your inbox in the background.
The setup steps and the list of supported apps are on the Grais browser extension page.