A memo written in 1977 has more useful advice on writing e-mails than a whole business class’ worth of courses. Number 8 in particular:
My last imposition on you for today is the excessive use of “appropriate” or “inappropriate,” when what the writer really means is either “legal” or “illegal,” “proper” or “improper,” “desirable” or “undesirable,” “fitting” or “not fitting,” or simply “this is what I want (or do not want) to do.”
Another duo to be expunged: comfortable/uncomfortable.
(h/t Josh Withers)