John Monroe alerts us to this piece by David Silverman.
I would offer two modest dissents. Not every email needs a call to action, some email may be For Your Information, on those occasions when no specific action is required, but he recipient has an interest in being informed. Like CC, this sort of email should be used sparingly, only when the sender has good reason to believe the recipient actually wants to be kept current. There are also many times when, for reasons of office politics, you might want to forward something with the non-committal what are your thoughts.