+1 for Deepl. Google Translate's quality is very close to Deepl and for a long time I couldn't tell which is better, but I recently discovered that Deepl does German brainfuck sentences correctly and Google and Microsoft Translate both mess it up. (In German you can say "the ball has the dog" and by conjugating "the" correctly ("der ball" and "den hund", iirc, or the other way around, I can never remember) it can mean "the dog has the ball" despite being in the wrong order.)

Aside from self-hosted email, my list is very similar to yours, I just wanted to highlight Deepl because few people seem to know it and it's a German company so I trust that a whole lot more from the outset.