No one wants to feel dumb. So when I replied to my manager's email asking what a certain acronym meant, he said it meant "no reply necessary." D'OH!
I felt so stupid. Not wanting to feel that stupidity twice, I Googled common email acronyms only to come up with hundreds of useless results.
As a solution, I compiled a list of only the 20 most useful email acronyms. Because if we invest a few minutes to learning them now, we lose the probability of feeling dumb later.