Unless the recepient is color blind or has another impairment. Also instead of highlighting important parts, one might focus on important parts in the first pla

Unless the recepient is color blind or has another impairment. Also instead of highlighting important parts, one might focus on important parts in the first place. That said there are valid uses for formatting. But unfortunately most of the formatted mails are harder to digest than needed. Especially if it becomes a longer exchange and people start highlighting in quoted mails.