When you edit or copy paste an email and send it, you are never sure what it will look like. I always feel that my sentences go to the line in places that I didn't decide on when in reality, the email is well formatted. Or even, I have the impression that you have to skip 5 lines to have space between paragraphs.

I saw that you added the “preview” feature but this is very time-consuming if you have a lot of different emails to write.