I was 100% interested until crossing "...with AI".

Then my 'amail' client seems to fit the bill.. (OSS, rust, I use it on Linux and haven't tested elsewhere) ..not really suggesting it – it's pretty barebones and just whatever I've needed, but you're welcome to it obviously! Especially if you have issues/PRs to spur me on to features I've wanted too...

If you took the time to read, it is an optional feature and uses local models.

Same here. While I'd rather not have an embedded AI chat window, is there a way to disable it?

The homepage says “off by default”