How do you feel about using ChatGPT (and other similar AI assistants) to write emails for you?

Sometimes I receive emails and when I read the text I understand they were written by ChatGPT rather than by the person. I don't judge it but it feels a bit cringe. I even received some beautiful long business emails that included copypasted (accidentally, of course) system messages from ChatGPT... Where's the borderline here? Share your thoughts and experiences!